@Pauuuuula because this is going to be a one time buy, I would actually recommend against buying the eGo one mega. You would be better off with a Kanger sub-tank mini, for a couple of reasons. First, the eGo one coils are awful, and the Kanger coils are somewhat better (although not great), and as a general rule, Kanger coils are cheaper too. Second, the Kanger sub-tank mini comes with a build deck, so you can use the tank with a prebuilt coil, and practice building coils with the build deck. That way, when you run out of coils, or decide you are ready, you can keep using the same tank and won't have to replace it. Third, the eGo one tank is just plain cheap and not well constructed compared against the Kanger sub-tank mini.
Also, everything I wrote about the Kanger sub-tank mini also applies to the TFV4 Mini, if you buy the "full kit" it also comes with a build deck. I didn't recommend it over the Kanger primarily due to costs, the Kanger is much cheaper than the TFV4 all the way around, coils are half the price, the tank is less than half the price (if you can find it on sale), etc. Ultimately though, both would be ideal for you. The TFV4 Mini is better than the Kanger,
BUT I use both tanks daily, because they are definitely both "good" tanks.
If you do decide to go with the eGo one tank, then you will want to find the CLR coils for it. The stock coils are absolutely miserable, and while I have never actually used the CLR coils with mine (it's really just sitting in a box right now) everyone I have talked to says the CLR coils are a LOT better than the standard CL coils, plus they can be rebuilt (that's what the R stands for).
I don't want to complicate things for you, so I would recommend NOT stocking up on TI, NI 200, SS, etc.
until you know you are going to want to try them. Given that you are just starting out, I strongly suggest staying away from temperature controlled builds until you are comfortable with a working setup that fits your vaping needs. It adds a whole new level of complexity to vaping that you probably don't want to deal with just starting out. If you do want to try temperature control vaping, just use pre-built NI/TI/SS coils for now, until you are comfortable with rebuilding in general.
As a final note, as already mentioned somewhere above, get a backup set of everything. You don't want a single point of failure. If you only get one tank, then the tank gets broken (it happens) you won't be able to vape at all. What you get is totally up to you, but when you buy it, ask yourself "If this dies, can I still vape with what I have left?" ... If the answer is no, then you should probably buy 2.
HTH and good luck!
