You are going to find a lot more bad PLO players than NL holdem.
People think poker is poker, but PLO turns into 3d chess very quickly. Generally, PLO is a game of straights, flushes, full houses. Its a game of draws and re-draws.
Start from the beginning and learn the hand strengths. Play tight and bet the pot with good hands. I personally would start with the top 30 hands.
When you start playing good tight Omaha, you will be surprised how bad the villains are (most people don't even know what the top 5 starting hands are, let alone 30).