From: New England (Boston)
Try to achieve the highest win % you can. How's that for advice? Seriously though, if you go back through the archive posts from this forum, we've covered just about any basic topic you can think of. It depends what time period you're testing for. For all 12 years, no less than 54% is acceptable, for the last 8 years go for at least 56%, for 5 years get 58%, 3 years 59%, last year over 60% at least. These are decent guidelines to get you started but it also depends on how many picks your formulas produce. If your formulas don't yield much action, your ATS's should be higher. Read Jefe's recent post on PSM. I mentioned different types of formula results last night.
If you have more specific questions, I would be happy to try to help you.