Getting shaving bumps is normal, there is a product in the feminine hygiene section I believe that you can put on after you shave that will help. It may even be with the shaving creams in some areas. Using something like Nair can help too because you are not shaving you are just removing the hair.
Discharge is completely normal and yes I would start wearing a bra to help support your breasts as they develop. Let me know if you need any help with how to choose your first bra and measuring yourself.
its normal! the bumps are from shaving and the discharge happens to everyone, your perfectly fine(: