tips for learning how to ride a bike quick?

I'm 15 and got my bike yesterday and my friend was trying to help me but I genuinely couldn't move properly without his assistance or him holding me then when he letted go I would peddle for awhile then almost bash onto something so I'd quickly break.

I need to be able to bike to school since me walking would most likely make me very late.

I've been told my balance is also really bad by my friend, but tommrow I'm going to attempt to practice by myself can anyone help?