A grant can take up to a year to be delivered from the conclusion of the application - so know that this process isn't a quick fix. Since that's the case, I would recommend you go to one of the annual "grant writing tips" sessions at TMEA this year for more information, since mine is limited.

That being said, search online for educational funding grants, music grants, various grants for schools, and the like. Read through the requirements and see if it's something that fits your needs. Then begin the process of filling out the application.