FTM needs advice

so I know this is gunna sounds dumb. but Im new at this and babys can be tricky. but how would I start a feeding and sleeping schedule. my baby is a 8 days old. I usually feed her Two to three hours apart. but some times I feed on demand. today she slept for four hours I freaked out like trying to get her awake to eat. she ate for five mins then passed back out for two more hours. I got worried and played with her until she was up. we fed for 13 mins and she was back out. is this normal? any advice would be great.