When dear son was around that age, he will want milk 1 hr after porridge/cereal, and i just gave him. when he is abit older, able to take more porridge then we slowly drag to 2 hours then give him milk. at this age, milk is very impt to them. giving solid food is just to let them try out diffe types of foods and texture. =)
I introduced fish to dear son when he was about 6mth+, i know some parents only intro fishes after 9-12mth old. as for meat, i gave him minced pork when he was around 9mth old.