Beating microlimit Omaha High-Low???

[Atropos]

Hey folks,
At the moment I'm only able to play Holdem and I decided to learn another game. Stud isnt the right thing because im too lazy to remember the exposed cards, so I now try to learn Omaha. I know I should buy some Omaha-Books, but since i spent a fair amount of money on Holdem Books and I'm still stuck in the microlimits, I decided I would like to win 30$ at Omaha first and then start studying.
So I need some general guidelines that would help me to beat the 0.25/0.50 Omaha High-Low Games at Stars.

1) Which Preflop Hands should I play??? Some site said:
Group 1 Hands: Play in any position for any number of raises:
AA23
AA2x
AA3x
A23x
A2KK
A2QQ
A345
A346
A356
A2KJ
23QQ
23KK
A3KK
A3QQ
A2KQ

Group 2 Hands: Play for a single raise in all positions, fold multiple raises in early position:
A2xx
234x
AKQJ
KQJT
KQJ9
AKQT
KKJJ
KK24
QJT9
AAxx
KKQQ
A3xx
KKTT

2) What are the odds of a "4-low" on the flop hititng the next card?