i see myself as quite a good omaha ring game player and i can give you some tips.
1. at low limits, preflop raises have no effect so dont bother, if you play at higher limits however, people will fold junk
2. Generally people see way too many flops in omaha and get in a lot of trouble, a lot of people play cards like a,k,7,3, but the question is what are you aiming to hit with this hand? the nuts straight or aces full of kings is your only hope.
3. starting hands still apply in omaha agaisnt what many people believe. I fold low pocket pairs, 6 and below, because your only real hope is hitting quads, as you will get a lot more set over sets, and full houses over full houses in omaha, especially with low pocket pair. Also hands like 6,7,8,9 double suited. Looks very nice, but be wary, only play after flop on a rainbow board with a large wrap draw (for those who dont know, a wrap draw is when you can hit any of 3 or more cards to make a straight, eg if flop is 10,9,2 and you have j,q,8,7, as you can hit any king,queen, jack, 8, 7 or 6 for a straight) anyway back to suited connectors, generally if you dont hit your straight get out of there, dont chase flushes with these hands, unless its cheap to see a straight flush draw as your flush will very rarely be good.
A general rule is play 4 good connecting cards, high pairs and 3 picture cards, also never play something like 2,3,7,8 and hands with 3 of a kind or 3 to a flush unless connectors or high, but be wary
4. dont get attached to your hands, a good rule is if you dont have nuts on river, be very wary. Also bottom 2 pair on flop is garbage to a re raise, and usually to a single raise so dont get attached. Omaha is a game of draws and redraws, so you only want to be calling bottom 2 pair with a high flush draw or straight draw aswell as your redraw to full house
5. if you flop the nuts, dont be over aggressive as if turn brings 3 to a flush or pairs board, your in trouble and probably need to fold. If you flop nuts with a redraw to flush or f,h then bet hard
6.Lastly pocket aces arent all they are cracked up to be in omaha, if you dont hit your set on flop fold them unless have nut flush draw
I hope this helps, im no pro or anything so a lot of the stuff i just said is probably a load of garbage but it tends to work well for me. Also this is for omaha hi, high-low is a totally different type of game which a suck at.
Lastly the most important in omaha to play well is know when to fold good hands a lot more than in holdem.
Was in a rush writing this so i apolagize in advice for any typing errors and so on.