You're good with the mod that you've got for now...unless you really want a mechanical. Not to say anything bad about mechs, but since you're starting out, having some sort of protection would be nice...also, you've already got it, so there's another plus.
Getting a RDA can be quite an experience. Head to a B&M and take a look at what's there. Talk to the employees and the customers and see what they're using. Not necessarily telling you to buy from there, but face to face is always better than over the web.
Start modest and simple. Single strand, single coils to start, and go from there as you figure out what you like, what your mod can handle, what your RDA is capable of, and how the experience and demands differ based on certain coils, different wires, separate techniques.
That's one of the things I like so much about vaping, is that it's so tailorable. What works for me, may not work for anybody else, and the key is to be ok with that.
All of the suggestions for RDAs here are good, each with their own quirks, but you won't know what you like or want until you try something for yourself. If you're nervous about actually building, I haven't been to a shop yet that didn't offer to setup a RDA upon purchase. At least a way to get you started while you continue your research. YouTube is good for most of it, but seeing it happen in person and being able to interface with someone who has experience is unbeatable...assuming they are also knowledgeable.
I drip exclusively and have 3 setups in front of me at the moment. Ranging from a Velocity with a quad coil setup on my Wud wrapped Sigelei 150W, a Big Boy RDA with a Staggered Fused Clapton setup on my DNA200 ERM+, and a Hubble II capped Mutation X V3 with dual twisted coil setup on my M16 Mechanical. I also like to play around with Alien and Arched Claptons, but there will be plenty of time for that as your knowledge base and journey continues.
Get to it and give it a try.