help me understand tailgating logistics

[rickyb]

Do I need a game ticket to tailgate?
Do I need to pay parking to walk in to the tailgate area?

Here is what I am thinking: me and a buddy will probably end up going to a game this year (we both live in Austin), and I want to get the whole experience. Tail-gate before, game, find a bar afterwards (to hopefully celebrate, rather than drown sorrow).

Do tell.