Read Atomic Habits by James Clear. Audible usually has deals, you can pick it up for a free credit with a killer deal rn

Trust me when I say this is the book you want to read for this case. Everything I know about building habits came from this book

Also don't try to do everything all at once. Imo I'd start with the sleep habit since without good sleep, anything else you do won't stick or will be muddied by the fact you're not getting enough sleep. It's more important than a good diet