With some freerolls you'll at least get an oppurtunity to see some hands and also learn what kinds of hands are usually taking it down.
I'd suggest reading up a bit on whatever game you're thinking about branching off into. There are all kinds of strategy overviews of every game to be found online.
Lately I've been considering getting into playing more Omaha H/L as I haven't played much of it at all. I've done some reading on it, went far in a couple of freerolls (final-tabling one of the Fantasy Freerolls on Fulltilt), then played some micro buyin mtts ($1 buyin). Even with a decent knowledge of good starting hands, you'll be ahead of alot of the field and it doesn't take long to see which players on your table know what they're doing & which ones don't (just look at the hands they're playing & how they're playing them).
It doesn't take too long to get used to a new game. I find I'm pretty rusty about knowing what shape my hand is in with a strong draw on the flop but it gets easier as i go along (I also check out hands in an Odds
Calculator after, to see where I was actually at). THen (just as in NLHE) you expand to other nuances of the game.
GL on stepping out of the comfort zone!! Hope you do well... most importantly 'i hope you have fun'!!