At the end of an omaha hand, you'll make two five-card
hands using two cards from your hand and three from the board. The first hand will be a hi hand, and the second hand will be a lo hand. The two hands can use different cards.
Example:
You have in your hand AA23
The board comes AA345
Your high hand is (AA) from your hand and (AA5) from the board, quad aces with five kicker.
Your low hand is (A2) from your hand and 345 from the board, A2345 (the best possible low hand).
If anyone has a low hand involving five cards 8 or lower, then the best low hand wins half the pot. Otherwise, the best high hand wins it all, or "scoops."
Your goal should be to scoop pots, so you want hands that are either great high hands or hands that have the potential to win both high and low (Hence AA23 being the best starting hand).
Most players won't play a hand without at least an ace and another "wheel" card (2 3 4 or 5)