I'd probably start with reading as much as you can on these games... Sklansky on Razz for razz, there's also a tiny section is SS/1 on razz. There's a good section on omaha/8 in SS/2. "Seven Card Stud for Advanced Players" is good for stud and I think it covers stud/8 also? I haven't read it. There are a few books on omaha and omaha/8 out there, I think Tom McEvoy has an omaha book. I haven't read that either. Anyway, these books should offer good launching points, particularly for hand selection and play on early streets. I think every player should understand starting hand selection well before they even really venture into the game. You need more than that to win, but I don't think you can win without it.
Not to sound harsh, but if you can't arrive at the conclusions that I did above, you might want to spend some time learning basic gambling mathematics. Theory of Poker has some in the beginning. Ideally every gambler should not only know basic probabilty but how to calculate EV in basic situations like this.
Software wise
http://twodimes.net/poker/
has simulators for all those games.
http://www.propokertools.com/
has simulators for some of them.
I'm working on a simulator that will work with most poker games. Haven't put much time into it recently, though.