Know who the turf sprint riders and trainers are at your track.
This is a good site -
http://partners.trackmaster.com/cgi-...=EQB&TRACK=bel
Know that 5.5F and 6-7F sprints are not the same - as Mike says, profile the winners and runners up.
Make sure you keep inner and main/outer surfaces separate.
Don't bet 5.5F at SA unless you use Timeform!
If you end up eating a lot of tickets, don't get upset - GREENS are good for you!