Filling out housing and other financial aid forms for SLO while on waitlist for other schools

Should I be sending in forms such as the form confirming that I do or do not make income as indicated on the FAFSA I submitted? I already SIR’d to the school, but I’m still waiting on two other waitlists. Also, should I make my housing deposit once I get the email, and is SLO’s housing deposit refundable? Is there anything I should not submit if I’m not 100% sure I’m going there?