It isn't easy to consistently make $50 or $100 a day playing poker. Because in poker some days you will win and some days you will lose. However, if you want to make $50 or $100 a day on average playing poker, then you should play low stakes cash games.
Omaha is considered, by some, to be the hardest game of Poker to master. Of all of the different games of Poker, Omaha is for many the hardest to learn to play and the hardest to bluff in. It is played most often at fixed limits, like Texas Hold'em and pot limit.