what do i have to do to a brand new go-kart engine?

My Grandad bought me a go-kart engine just before he died and i was wondering what i have to do with all the fluids and everything before i start it up. What fluids and where to put them?
it wasn’t filled whem it came in the box This is one of the things my grandfather wasn’t able to teach me before he died but i do know alot i know you have to put oil and gas in that’s pretty obvious but there is other things you put in to make the engine last longer
and run better

if the motor came already filled then put gas in it and go. if not you’ll need oil too. look for a small twist off cap thats probly the oil fill. also besure you know how to check the oil because if you put too much in you can mess up your engine if you don’t have enough you could also mess up your engine. best to find someone that knows what they are doing and ask them because all motors are different so i couldn’t tell you with out seeing the motor