mash

I think everyone has chimed in with some good advice. The best thing you can do (other than properly stretching) is just try and have fun. PLaying goalie is great fun, but it can be terribly frustrating too if youre not playing well. Have patience with yourself and dont worry about it too much when you let in some goals. As far as gear goes... buy used on ebay or craigslist. Invest in a quality mask and jock though;)