?. So you're adding a job to your ECs? I'm not sure what you're adding.
Financial aid is usually a completely separate process that occurs after you'be been accepted, or at least interviewed (for non-rolling schools), and is handled through the FAFSA (with parental info your first year) and the school.
As a heads up, typically financial aid will not cover living expenses in the first 2 summers. YOYO.