I do not think you are ignorant. Learning how to care for babies is complex - so much that some people go to school to learn how!
So, my suggestion is this: I am assuming you are not trying to wean along with starting solids. (Extended breastfeeding is good for both of you.) I would suggest feeding solids when baby is hungry, but not *very* hungry. Its not essential to nurse right after feeding solids (as baby's tummy is only so big, can only hold so much). The best suggestion I can give, really, is to listen to baby. If he's hungry and interested in food, give it to him. If he's not, don't force it as this can delay interest in food, and leads down the path to obesity. . . I admit, I did feed my son cereal, but I think with a second child I would reconsider. For the most part, my son preferred (and still prefers) to eat "real food" - that is, food from my plate, rather than prepared "baby foods". Its quite easy to mash up a little of what you're eating (or use a blender) and feed to baby. And this too, is based on interest in the food and how hungry he is.
Mostly, relax, trust your instincts and your son to communicate his needs to you.
Good Luck!
Ray