Starting out

I just installed Unreal Engine 5, I am 17 and I really want to put some time and effort into an open world racing game if anyone could help me get started that would be amazing. I have almost no idea what I am doing but I do know all the file types and stuff like that I need for it. I have an idea and a thought for how big I want it to be what cars etc. Thank you to anyone that tries to help.