Hi lennedsay. These are my views on the first time birth experience: Its usually quite a long drawn out affair, so maybe bring along a Vita or if you're poor maybe a chess board.
Gas and air are lots of fun, I took one hit and had a tiny sleep for a few minutes, waking up feeling hugely refreshed! So give the man a hit, don't be selfish.
The nurses hand out sandwiches to the pregnant women, these are laced with muscle relaxant, and although tasty, can play havoc with ones innards if you're a man, so warn the father beforehand.
Be yourself.