Things are so complicated now for beginners! I'm glad sub-ohming / direct-to-lung was not the big thing when I first quit, because I don't think I would have ventured into vaping if that were the case.
Juwlz068, the basic picture is that there are two main types of vaping. One way is called "
mouth to lung" vaping, and it's similar to how one smokes cigarettes, inhaling to mouth first then to lungs, or even just exhale from mouth or nose without inhaling to lungs. *Usually* that means lower power (watts), higher resistance (ohms), and the full range of nicotine strength (anywhere from 0 to 24 mg, or even, for a few, above that).
The other way is called "
direct to lung" and it's inhaling directly to the lungs. Typically, this means higher power, lower ohms (almost always "sub-ohms" -- below 1 ohm), lower nicotine (often just 0 to 3mg). This way produces more vapor, requires more power, uses a lot more e liquid, and vaping higher nic liquids can be quite harsh.
Mouth to lung was the first way that vaping was introduced. Later, direct to lung became popular, especially among "cloud chasers" -- people who wanted big clouds.
Either way is fine, but direct to lung can be more difficult in the beginning. Many remain mouth to lung with no desire to change, and some use both/either technique, just depending on what they feel like at the moment.
The two generally use different tanks, but many mods can work for both. I'm a mouth to lung vaper, and generally prefer smaller mods that can deliver from 20-80 watts. I actually only vape at from 8 to 15 watts, though, and usually use 1.2 to 1.8 ohm coils. I only use 3 mg nic in my e liquid because I vape a lot.
My personal advice would be to start with mouth to lung using the e liquids you have purchased, and then later when you are comfortable with that and more familiar with what you like, you can explore if you would enjoy direct to lung. People here can give you recommendations for good mouth to lung kits if you'd like to go that route. I would start you off with a iStick Pico as your mod, and a good tank: for drop-in coils, I'm most familiar with the Nautilus Mini, which is a tried-and-true popular tank, but there are other good options that ECFers can recommend.
Good luck, and stick with it! Everyone here will be happy to help as much as they can.