Welcome MB73,
You have had good advice from SpicySaffron, in my opinion.
I began as you did, with disposables... or the recharable version of them. I spent (wasted? probably not) some time and not too much money finding sources for cartomizers and additional pen style batteries. None of that stuff tasted especially good, or lasted very long.
I'm not interested in what my gear looks like to others, and as I don't see it while vaping, I have stuck to function in choosing what to use.
My wish list was pretty straightforward: A charged battery should last about a day or more, and the liquid/vapor source had to more or less keep up with the battery. I wanted a fair amount of vapor without having to suck hard or keep the thing going for ten seconds.
One of my kids gave me an eGo style clone, probably in the 650 mAh range. It charges in about 2 hours, and lasts all day. I was a pack a day smoker for decades. That should give an idea of how much I use the e-cig.
I bought three Kanger Protank IIs, as I'm really anxious not to return to cigarettes, and I like a variety of flavors to keep vaping interesting.
I alternate between strong, dark tobacco flavor and something much lighter, like green apple or lemon. That works for my tastebuds. Your flavor choices are almost limitless, so try quite a few, and find what you like.
Just ordered a larger, variable voltage eGo type fat pen-like battery, the Vision Spinner. I'll probably get a smaller Protank that's easier to carry around, and also some EVOD cartridges and a very small batteries to take when I'm out of the house.
This is all pretty simple, basic hardware. Once I've settled in with this stuff, I'll try rebuilding burnt out coils. Might even try mixing my own juice, but that's a few months down the road. For now, I'm getting my nicotine needs fulfilled with some nice flavors, and not obsessing at all about the hardware. I prefer not to make vaping a hobby. Rather, it's just a healthier, more pleasant way to deal with a habit/addiction. The longer term goal is to gradually reduce the nicotine content from 2.4 mg to something considerably lower, maybe even zero, but I'm in no hurry.
The people in these forums have been wonderfully friendly and helpful, despite the seemingly overwhelming jargon. I've asked for help and received great replies.