Schedule for 9 week old HELP!

Am I the only one who doesn't have a solid sleep schedule for my 9 week old? He is formula fed but every day is different some days 3 oz last him 2 hours or 2.5 hours or even 3 hours.. because of his reflux it's hard to determine how much is too much some days he spits up a lot somedays he doesn't. Some days his naps are long some days his naps are short. Some days he wakes at 4am to feed some days it's at 5 and I don't want to force a 7am feeding no matter if they already ate an hour ago like some books say because I know his reflux it will all come out? Im worried I will never have a schedule.. I want a schedule for him because I heard it helps babies. Plus it would be nice to plan activities too. Help!