The skill in Omaha8 is to scoop both pot (hi and lo), and to do this you need to play very tightly. Hand selection is the key to success in Omaha8.
When you play pot limit omaha8 online you often see 6 or 7 players calling and raising preflop, and alot of the time you will see split or quartered pots because alot of people tend to be playing for either hi or lo but not necessarily both.
To try to show what I mean, take a look at the example Ive set up below.
Player 1=

Player 2=

Player 3=

:10c
Player 1 has a monster hand. there are possibilities for the nut lo , str8 and str8 flush potential for hi.
This is a big starting hand to play agressively.
Player 2 has potential for a nut lo and a high flush but will have to quarter the llo pot if he hits the nuts. the 6 & 7 give back up to mid range str8 possibilities but in truth if he plays this hand he is unlikely to catch the hi pot and will end up getting back less than his pot investment if he splits the lo.
He will of course play the hand blindly, solely because he is holding A2 with a suited kicker for his ace.
Player 3 needs high cards on the board to have a chance to scoop the pot because he is ineligible for the lo pot even before the flop.
He should not commit too much money to the pot unless he hits big on the flop.
FLOP=

Turn=

River= :10s
You can work it out for yourself, but the point is that omaha8 is a complex game where the most immportant decision you will make is what to play and what to fold.
If you continually chase the high, or the lo, you will lose money in the long run.
You MUST have a shot at both hi and lo to make a worthwhile hand.