Feeding schedule

Hi my LO is now 6 months+ and i need to know after i feed him with rice cereal when is the right time to give him his next feeding (milk)? 3 hours later? Im giving him the cerelac nestle and gerber rice cereal. Usually how much would need to give to baby and how many times? My boy still have gassy stomach so am scared will overfeed him and cause him to have pain. Thanks mummies