Overwhelmed by feeding guidelines information.

I have an almost 7 month old Maltipoo. I like to feed him a combo of wet and kibble for his meals. Does anyone have a handy reference for me to figure out how much of each he should be getting for each meal/daily? I really don’t know if I’m feeding him too much or too little. And right now I’m not following any guidelines. I have bought a scale to help with portioning.