flight in a few days, what do i need?

okay so i (18) plan to stay with a friend, so i wont exactly have proof of accommodation, i also mainly have cash, so would that work as proof of funds? i hope they dont ask for any of these and im just boarded onto the plane 😭 im middle eastern, my passport is kinda mid but not bad but not amazing either. also do i need a proper return ticket or is a bus ticket to the US fine? i have a visa for the US too but no bookings either i plan to just figure it out as i go. plan to book the return ticket before entering the US and deciding how long i want to stay. please dont tell me cash is a bad idea, i know it is, im trying to get my card situation figured out but i have enough in cash and can always get my parents to give me their apple pay cards later once its all sorted but this is what’s happening now and my flights already booked so 😭