I have a garbage disposal on a septic system. We've had one for over 20 years. Now, they do make a garbage disposal unit that is supposedly more friendly for septic systems-- Insinkerator one.. can't remember the name, but I was told that you don't really need to bother with that. It doesn't really make a difference.
Tomato skins will get stuck inside your garbage disposal, so don't throw them down (I had to clean some out of my grandmother's disposal with my hand when she couldn't figure out why her disposal was clogged). Do NOT pour grease/fat down your sink or disposal. Dump it in to a trash can or something instead.
Clean your disposal with COLD water, not hot. You can put ice cubes in every once in awhile to grind up.
I've found that a garbage disposal on septic system is very similar to using one on a regular system.
One thing though: Those "flushable" wipes are NOT flushable. Do not flush tissues, wipes, or anything other than waste and toilet paper. You can use RidX from time to time if you want.