Just my thoughts, but when I first started with RBA's (or RDA for rebuildable dripping atomizer) the IGO-L was (and still is) great as it is pretty simple, large, and cheap. The only con I can really give it is that the coil connections are to a post screw vs. a hole in the post but that is all. So I got some resistance wire and silica wick and had a go at it..
I had gotten my ProVari at this time so I could check Ohm's and had the security of safety protections of the device. I had done a ton of reading here on ECF ^^above advice taken^^ and watched a lot of videos. Had a "safe vaping chart", some basic tools, and a curiosity. It worked wonders for me and I have never gone back to disposable attachments.
Start with easy and learn as you go, my advise is to not get complex systems but rather try simple inexpensive ones. See if you like it and want to one up yourself (or others

). Every time I think I am the cat's meow someone here does it better

so I go back to tinkering hoping to have something to add..
Little self show off here, thought I was all good then super_X_drifter's posts taught me to be humble but this is my latest:

Anyway welcome to the never ending world of finding a better vape, it is fun, take your time, ask questions, and thanks to everyone here who has helped me out along my journey!