Well, it's a small world, I actually started studying Omaha as well this week. It's an interesting game, and we do have some material on it, but it would probably be better to focus on Hold'em for the time being.
Looks like you prefer cash games over tournaments, so I suggest taking a look at our overview of NL Hold'em lessons. This should contain everything to get you on your way, and it is structured in a coherent manner. There is also a great =en&submit=Search"]video series (forum thread here) on shorthanded cash games by our coach w34z3l, but you would need to have at least silver status to access it. But since you already have a tracked account, maybe this is something to check out in the future.
We also have a few articles on Twister/Spin&Go poker, which can be found here and here.
It might also make sense to take a look at some of our Basic articles. I don't know how much experience exactly you already have with poker, but I assume that you can at least skip the articles on rules and terminology. Everything else should be useful, but that's your call.
If you have any more questions, don't hesitate to ask.