Kanger tech somethig or other - wasnt very expensive...
Alright... I'm guessing you have something like an Evod as a topper (a plastic tank with a colored metal sheath and a clear plastic tip) and a longer, ego-style battery. I'm going to offer some
minimum suggestions based on this assumption.
The bare minimum I would suggest in this situation is to have at least two batteries. This way, you can vape on one while the other charges. That's for starters.
--> If you only have one battery, get a second one.
Is your battery variable voltage and/or wattage? The way you can tell is that the end of the battery has a little dial that you can turn to adjust the strength of your vape. If you don't have this, then your battery is fixed in its output. This will result in your vaping experience slowly declining as the battery runs out of power. Batteries of this sort come in a range of sizes and capacity, usually from 650 mah to 1600 mah (mah stands for milli-amp hours). The larger the capacity, the longer the battery can run before needing to be recharged. Generally speaking, 650 mah will last you about 3-4 hours of regular use, while 1300 may last most of the day.
--> If your batteries are not variable, the next minimum step would be to get a variable device (sometimes called twists or spinners). [This step could be skipped if you wish to get a variable wattage device (see below).]
If your batteries are variable voltage, but not variable wattage, then the next step might be a variable wattage device. These come in many shapes and sizes, ranging from a spinner-type battery to a complex advanced personal vaporizer (APV). There are many choices in this category, depending on personal preference, size, shape, and cost. Two of the most popular items these days are made by Innokin. The first is the iTaste VV/VW V3 which has a similar form-factor to a standard ego battery (similar to what you probably have), has an 800 mah charge, and can be found for $26-36. The other popular device is the iTaste MVP2 which is a boxy battery approximately the size of a pack of cigarettes, holds a 2600 mah charge, and can be found online for as little as $40. There are many other APVs out there...
--> If you have a variable battery, the next minimum step would be to purchase a variable wattage device such as the iTaste V3 or MVP2.
With regards to toppers: There is much more variety to toppers, including cartomizers, cartotanks, top-coil clearomizer tanks, bottom-coil clearomizer tanks, and drippers.
Since you have a Kanger starter kit, you will likely have a bottom-coil clearomizer tank. Such tanks can be made of plastic or glass. Glass is preferred by many because it does not absorb the flavor of liquids like plastic does and is not susceptible to tank-cracking flavors (such as citrus or cinnamon flavors). Glass does, of course, break more easily if dropped or crushed and is often slightly more expensive than a similar plastic tank. Some Kanger tanks look similar to each other in both plastic and glass versions, so don't necessarily assume you have one or the other.
The original Evod tank is plastic and comes with a single coil. A coil is the part in the atomizer that actually vaporizes the liquid. Some atomizers have dual coils--two coils vaporize the liquid, generating more vapor but also using liquids more quickly(and costing more). The use of either comes down to personal preference. It is worth noting, however, that two of the more popular high-end tanks (the Kanger Aerotank and the Aspire Nautilus) come with dual coils.
Evod tanks are bottom coil tanks, meaning that the atomizer sits on the bottom of the tank, using gravity to feed the wicks that bring liquid to the coil. To fill these tanks, the tank must be removed from the battery, tank turned upside down, and the bottom removed so that liquid can be applied. The other general class of tank are top coil tanks such as the iClear series. These tanks have atomizers with longer wicks that pull the liquid up to the coil. The downside is that some thicker liquids may not be able to wick up as quickly (fighting gravity), resulting in dry hits (although tipping the device nose down helps alleviate this problem); the upside to top coils is that the flavor can often be a little sharper.
The original Evod is a smaller, ego-style tank, with a capacity of around 1.3-1.5 ml (the exact capacity escapes me). Ego-style tanks are those that use ego-threading, which means that the screw threads are on the inside of the tank and screw to the outside threads on the battery. There are some ego-style tanks with larger capacities (such as the Kanger T3S or MT3S) and there are higher-end ego-style tanks made of glass (such as the Protank 2 Mini, the Protank 3 Mini, etc.). Some tanks come with 510 threading. This is a connection that was popularized by some ciga-likes. Tanks with this connection have a little knob on the bottom with screw threads on the outside which screw into a battery's inside screw threads (similar to how your battery likely connects to its charging cable). Some brands prefer this type of connection, and many of the larger tanks use them. There is no real difference in usage--but knowing what connection you have or need can make a difference in what equipment you might need.
--> Based on the above, and assuming that you have an original Kanger Evod tank, the next minimum step up would be to purchase a larger, plastic, single-coil Kanger T3S (all plastic) or MT3S (plastic sheathed in metal), a plastic, dual coil Evod 2, or a glass (sheathed in metal), dual coil Evod Glass. As noted above, however, there are many choices--and that is just for tanks!
Whew! I hope some of that is useful to you. Again, the above suggestions are
MINIMUM step ups from what you may have. I know there will likely be plenty of people chiming in on this, that, or the other thing (get a mech! drip! get a kayfun)--when you ask what is "best" on this forum you will end up with a hundred different opinions. The most important part of a setup, though, is finding something that works for you, keeps you off cigarettes, and doesn't drain your bank account.
I gave them up again about a month ago when i purchased my first vape "machine". I am now fully converted and devoted to this wonderful new "hobby"/way of life. 
