low reps , heavy lbs, incline and flat bench with dumbells ( bar bell is ok but i avoid it, db are better IMO) and hit it hard 2 x a week. each time for 30 or so min. NVM push ups IMO, not if you want mass on chest, and let chest rest for a couple days before pushing it again with a heavy chest workout.
if anything do some push ups when you wake up to get blood flowing and energy too. I wouldent hold my breath for much results in chest from pushups IMO, but some push ups are good for yu. i would swap them out for what i noted above though. and mayse do pushups 1-2x a week if doing that many (you grow when resting, not over training)