Tips for being on top

So I’m dating this guy who I’ve known for years since 13 and I’m 18 now and he’s 19 we’ve liked each other and kept in contact over the years not on the daily but in contact here and there and were planning on having sex soon when he comes in from out of town work close to Christmas and my weak spot in sex I feel like is being on top guys say I’m good at it but I feel like I’m not that great what are some great tips for being on top ???