<< how much can i expect to spend total? >>
Depends on the field. My local one sells rental packages for like $35, which includes a gun, mask, tank, and 200 or 500 rounds of paint. Paint is the biggest expense, with a case (2000 rounds) costing nearly $100 at most fields, if not more. You shouldn't need an entire case for the day, especially with a rental marker.
Oh, and if you borrow a marker from a friend, keep it under watch at all time. I know of a couple people who had expensive guns stolen at SC Village