With something like the Noble Poker survey offer, you can get a $5 starting stake, and try building that up. They've got $1 Sit-n-Go's, and the 6-player Omaha Limit H/L tournaments on there have really bad play, and the $0.02/$0.04 Omaha H/L ring games are no better... and the PLO8 games don't seem to have that great play either, so you could build up your bankroll using any of those (my free bankroll on there is currently up to about $25 from playing a mix of those). If you're looking to build a bankroll up from nothing, then that's probably a reasonable place to start.
Another option is playing on one of the Prima sites like 32red. It's mostly HoldEm on there (with a little PLO8 action), but there are a few $1,000 freerolls every day. Some have over 10,000 players, but others have under 3,000, and 260 places are paid (paying $1.50 upwards), so it's another place you can get a starting bankroll.
The Micro limit games tend to have very loose players. They can be very straightforwardly profitable, although (at least on the holdem games) you'll see plenty of bad beats and have larger swings. You generally need to play a tight, solid game.
My impression so far is that the short-handed micro-limit games require slightly different strategies from those advocated in most 'pro' books, though, because the style of play prevalent on there is different. Bluffs will rarely work in the Limit games, so you'll want to play solid hands post-flop, although when play is only aggressive post-flop and most players see the flop, then speculative hands like suited connectors become more worth playing. In No Limit games, see if you can spot one person stealing most pots by raising, who plays any cards, and then you'll have a good target - try to play heads up against them (possibly easier when short-handed), and you'll generally have the better hole cards, and will have the better odds most of the time. If they push whatever you do, then you can get all your chips in when you're confident you're ahead, and if they fold when you play back at them you can steal off the stealer, or call their bets to keep them putting their chips in.