Omaha is a very strategic and complex game.
Especially when you get into hi/lo stuff.
As dive stated there are some really good post on here about omaha and some good books.
But to answer your question my favorite hands for omaha hi/lo might be something like this.
Ad5dAcKc,or maybe like this Ad2c3cKd,some thing like that.
Obviously I like to look for suited connectors both hi and lo.
The main objective to hi/lo omaha is to have the nuts being both hi and lo.
It is an extremly patient game.