how much baby food?

How much baby food do you ladies give your LO? I'm just starting and wondering how much I'm supposed to give him? Only one spoonful of the small little baby spoon??? Is that all I'm supposed to give? What if my LO wants more? What if I give too much? How many spoonfuls of the little baby spoon can I give? He spits it some of it so I'm not sure.. I'm a FTM sorry if it's a dumb question lol. I just don't want my baby's tummy to ache or him to be constipated..