A.P.
My LLL Leaders always describe food & nursing during the first year or so like this:
The nursing should be a cake & the food the frosting. The VAST majority of it should be nursing & just a little bit of food, since it really doesn't provide much nutritional value during the first year or so. It's more for practice than nutrition.
Whenever you give your child solids, he should nurse first. That way he fills up on the good, nutritious stuff first. Then offer him some solids (2-3 times a day is perfectly fine for his age).
You can NEVER nurse a baby too much, so as often as he wants to is perfect!
He'll lead the way for you. He'll let you know what he wants & how much of it he wants. Listen to him & listen to your gut (which is sounds like you are).
LLL's "Womanly Art of Breastfeeding" & the Dr. Sears books (The Breastfeeding Book & The Baby Book) all have fantastic info! www.KellyMom.com always has the latest info as well as www.AskDrSears.com
Good job, mama!