how to computer science

i’m 17 and soon graduating, i want to become a computer sciencemajor and want all the tips, guidelines, side hustles, and all of those sorts to help succeed and to have a head start, how should i prepare and how should i schedule myself. i need the wise to pass down information, i know it’s vague but i’ll take anything (its 3:30 am so idk if i’m typing alright)