हे i am starting high school and i have been playing the गिटार for a while and i know a few people that can play drums and bass, so how do i start a band?

Ask them to शामिल होइए you.

First see if आप have permission from your parents. Then find a place आप can practice together. It can be anywhere, like Parks, गेराज of any member, या a coffee shop. After आप have done these things decide a cool name for your band depending upon what kind of band आप are making, and ensure that it isn't same as any other band. आप can make a Rock and Roll, Emo, Punk, या any other genre आप like. Then after आप have decided the name start practicing. First as beginners आप can sing covers of your fav songs and later आप can write songs on your own. To popularise your band आप make band posters and paste it on public places so that people would come to know about it. आप can organise small shows at occasions like your friend's birthday या some get-together parties.
So, get going and rock it!! I think this will help you. :)