Sorry for the late reply. Was up gaming for several hours before checking in here, and passed out in my chair, *gonna pay for that all day today -_-*. Cartomizers are a good, basic, easy maintenance attachment for a beginner as well as a great backup. You mentioned you might get a Provari or other APV. Going to go that route as your base to build off of, for a beginner, you'd be better off starting with having a 510 drip atty on hand, about $8 USD, and can last up to 30 days heavy use, and a few drip tips. Next would, if you are going to go the route of a cartomizer, look at a DCT, SmokTek, IBTanked, or other such system. The principle of the DCT, some swear by them, is longer usage between refills, the cartomizer is pre-primed, first filled outside the DCT, this helps in allowing flow and seeping from the tank later on. The cartomizer is pre-punched on the side(s) depending on thickness of juice, or horizontally slotted on the side with a dremel tool. Once punched or slotted and primed it is inserted into the empty DCT, and now becomes your atomizer, or coil system only. After that you back the cartomizer out a bit to get a gap at the top of it between the DCT top cap and the top of the cartomizer, then you fill the DCT up with liquid to the top or close to the top of the cartomizer, slide the cartomizer back up into the top cap of the DCT, and then place a drip tip on top. It is now ready to run and gun, and now the concept puts the combination into play. As the cartomizer burns up liquid in its filler material, liquid is pulled out of the tank into the filler to replace it, and when the DCT gets low on fluid, you just have to refill the tank, when the cartomizer coil finally gives out (about every 2 weeks) you just have to replace, punch/slot, and prime a new cartomizer, not the whole tank.
Another option to look into, also has an array of variety, but is really more simple for a beginner, is a clearomizer. These use a wicking system, bottom coil short wick filled from a bottom cap, to a top coil long wick filled from the top cap system. Bottom coil examples, iSmoka BCC mini (1.6 milliliter capacity) or mega (3 milliliter capacity), Innokin iClear16 (1.6 mil) or iClear30 (dual coil 3mil), Kanger bottom coils like the T3/MT3 (metal sheathed plastic)/T3S (Upgraded T3)/MT3S (upgraded metal sheathed plastic) (3 mil capacity), Evod (1.6 mil capacity metal sheathed plastic), Protank (Stainless and Pyrex Glass 3 mil capacity), Vivi Nova Mini (top coil 2 mil capacity) or Vivi Nova regular (top coil 3.5 mil capacity). The strengths of these attachments are they are easy to refill, maintain, care for, steady performers, and relatively cheap to keep running, to insanely cheap to keep running, excluding the iClears which I'll explain. In the beginning, if a coil is bad from the get go, keep it around in a storage bin with ones you have used and the coil has lived its life, just have to unscrew the coil assembly and replace with a new one, 3-5 USD a pop each new head. Later once you've got this replacement down and you stated you like to tinker, start getting practice recoiling and rewicking them, the iClears no one as yet has found a way to recoil them effectively, but the rest mentioned can be. Just takes some patience, getting the supplies, coil wire like kanthal a-1 or nichrome, probably 30-32 gauge, I use 32 myself on my T3S heads, and some silica wick, I use 2 milli-meter silica. Next is you just need some small diagonal or flush cutter, and a decent multi-meter, lowering your overall expendatures to pennies a day, just basically liquids being your major expendatures, and all those heads that were bad from the get go or lived their life that you used before can now be re-birthed back to life.
Hitting you with a lot of information there I know, just take down notes, and peruse the sections on these attachments, and the more advanced things like the rebuilding at your liesure and pace. I've been at this a few months now, with a lot of devices on my inventory, excluding having a Provari myself, I do have and used basic atomizers, cartomizers, couple DCTs, all of the clearomizers I've listed, and different battery bases, and now getting into more advanced systems like my 3 new purchases, a Phoenix rebuildable drip atomizer, and 2 RSST rebuildable tanks, I still exclusively run most of the day out and about on my T3S's and my 510 drip atty's at home, but it has turned into a hobby as well as a smoking cessation alternative

. Just depends how simple you want to get started with.