If you havent got anything yet, I would look into getting a smok alien kit with the tfv8 baby beast. It can go up to 220w and has tons of different coils so you have many many options and plenty of wattage control with the mod to cover those options, as well as it would take you a long time, if ever, to outgrow that mod since it goes up to 220w. Most tanks or rba will fit on it if you want another tank and when you're ready to start building your own coils. The factory coils have really good flavor and vapor production. You can also change your draw from min to max with about 3-4 options in between. The full kit you can get for about $50-100 depending where you shop. You'll need batteries as well but no biggie. Better off w a mod that has replacable batteries. The premade factory coils can also be easily found anywhere, and you rebuild them very easily if you want to save some money. You can also get a rba for the baby beast. They're ok, cheap enough to be worth having to get the feel of building.
I just got a crown 2 tank for $10 off some website. Great flavor from the .25Ω coil. Some ppl say the coils crap out quickly. From what i have read and experienced, uwell fixed the coil issues. I have had no problems with mine. On the same one after 1.5-2weeks and still has great flavor. These premade coils can also be rebuilt really easy. Lots of premade coils from lots of companies, its a good idea to poke a couple tiny holes in the wicking ports with a safty pin, or any small/thin pin. Helps wick faster so you dont get dry hits on coils where the cotton is tightly packed. Especially after they start gunking up with sweeter juices, especially if you chain vape. Not always nessecery, but helps a lot and makes them last longer.
I also got a tvf4 for about $10. Great tank, super easy top fill with swivel cap so you dont have to unscrew it to fill (tfv8 has this as well). Again, lots of premade coils, even few different rbas. Should even come with one. I just ordered one of the rbas off mt baker for less than a dollar lol. Then ordered a third rba for the tank that also comes with a premade coil for $10 or less. So the rba head and premade head for $10. Once they arrive, ill have 3 rbas for this one tank. Cant go wrong with smok tanks and coils.
Hadaly or kryten rda clones by sxk can be found pretty cheap and they're a really good clones and really good rda, then if you like it you can go for the authentic if you really want, but probably wont have to. They also come with a separate bottom feed pins if you get a mod that has a squonk bottle in the future. Hadaly for single coil great flavor, kryten for dual coil good flavor bigger clouds.