[Eidolon]

• If you've got access to ice this summer, get out there and get the feel for your skates and equipment in low pressure situations first, like stick and puck or open skate. Just wear the pads and skates and get used to how your center of gravity is different and how movement is changed as a result. Similiarly, if you've got a catcher, play catch with it on to get the feel for how it's different from a baseball glove.
  
• Be sure to stretch well, with an emphasis on the groin, thighs, hips, calves, etc. Hate for you to tear something your first night out because you THOUGHT you could do something you hadn't done up to that point playing defense.
  
• Find out when the local rink has drop-in or if there is a summer league. Go watch the goalies there. You'll be able to quickly tell who you should be studying and who you shouldn't. Get a seat or stand in one of the corners behind the net you're watching and focus on his/her movement. Pay attention to their depth as the play approaches, how the move from post to post, how they communicate with their teammates during play, and how they position their hands. These are all things that you'll have to think about in the beginning, but will become second nature as you progress.
  
• Research: ask questions here and of other goalies at your local rink. Read as much of this board as possible. Look into the book "Hockey Goaltending" by Daccord. It's a good compact source of tons of good info on stretching, gameplay, save selection, equipment, self-evaluation, etc.
  
• Lastly, once you've got a good foundation of info, throw yourself out there. Go to some stick & pucks with your gear and start taking shots. Work up to some lower level drop-ins.