As far as a job baking, does your local grocery store have a bakery? That would be one avenue to look into. Or does Subway still make their bread daily? (Obviously it’s been awhile since I’ve been to Subway…)
If your school or community allows homemade baked goods to be donated/sold, then perhaps there could be a weekly baked goods sale (with others besides yourself contributed baked goods) and then the proceeds could be donated to a rotating charity? If, for instance, this was started at your school, I could see how it could become sustainable once you graduated if underclassmen continued it (and I could see high schoolers miss not having homemade baked goods every week).