Originally Posted by hotwings18
You should look into either Super System or Super System 2 by Dolye Brunson and Co.
Be aware that the original Super System
doesn't cover Omaha8 (or even regular Omaha).
Nor does it cover Stud8 - Sklansky's chapter on high-low stud talks about the version played without a low qualifier, which isn't played in any standard HORSE game and requires a somewhat different strategy.
So the original Super System
only really covers three of the five HORSE games. While I haven't read it all in detail, I believe Super System 2
covers them all (and other games besides).