When do you start to give the baby food? such as brands: gerber,beech nut as in 1st stage?

I started my babies about 3 or 4 mos on rice cerial mixed with formula. Dont make it too thick.They all liked it a lot and a little later I started adding pureed peas, apple, potatoes etc to it. Only add one new thing at a time and wait a couple of days between giving the baby new food to make sure he is ok with it ( no rash or diarreah). Wait until about 7 mos to give meat and dont give him any eggs, or peanuts before he is one.