first thing is first...do your FAFSA when the time comes
the school will help you apply for the Stafford Unsub. Loans which equates to $42,000 per year for 4 years. This doesn't cover the full cost. You need to go out and apply for a Grad Plus Loan which covers the COA (Cost of Attendance minus any other loans/scholarships/etc)
For example your COA is $100,000 a year and you received $42,000 in Stafford Loans. Therefore your Grad Plus Loan would be $58,000. If you need more money on this, then you have to apply for Private Loans from banks (you will only need extra money if you have a family and your spouse isnt working)
Or, you can choose the military route, but do not do it just for the money.
Good Luck