If you are traveling, you can request advance travel and receive those entitlements sooner.
Everything FormerRecruitingGuru said is spot on (and he's a much better resource than me). However, anecdotal perspective: When I graduated OCS, good luck getting a travel advance or any sort of entitlement. (Just like when you get down to Pensacola for API at NASC, good look getting house hunting leave, but that's neither here nor there for you at this point.) Attached to OTCN (Navy OCS's parent command), you'll be earning E-5 pay <2 years of service (important: NO, this does not make you a PO2, it's just for admin purposes you're assigned that grade for pay purposes); if you're single, you will also not receive BAH or BAS because you're living in government quarters and dining in government messing at no cost to you. Not to worry - again, if you're single- you won't really be spending any money while at OCS (with the exception of the uniform bill at the end). So, you should have a decent bit more in your bank account when you get out of there. At least I did, but like I said, depending on your circumstances YMMV.