I think the trick will be to be able to produce good quality JPEGs right out of the camera. I have shot a bunch of minor hockey this year and the one and only time I shot JPEG I was not happy. Lighting is so iffy in most minor hockey rinks that there is almost a need (at least for me anyway) to shoot RAW and then adjust the images in post processing. This of course takes time and probably not something that will work when parents are at your booth 60 seconds after the final buzzer looking for Johnny's picture of the breakaway he had in the first period (which of course will be the one image you did not get)!
I have seen many photogs set up at hockey tourney for this though. Clearly they are either processing very quickly and then posting images, or they are shooting JPEG and parents / players pretty much get what comes out of the camera.
If you can master the image quality aspect you should also have a couple of monitors set up so that people can view the games you have shot on the monitor. They then need to be able to order an image or more. Have order forms handy that they can write team name, game and image number on and of course have prices on this. Another option too is to offer digital images. I once bought an image of my son for $25 burned on CD and then I could reproduce anyway I wanted.
Make sure that you build in some lag time for printing photos. For example if a parent orders a photo, have it ready for pick up the following morning or in X hours. I don't think you should be expected to produce a print immediately on request, particulalrly if you get busy.
You should also let parents know that ALL images will be available on your web site after the fact so that they can come back and order if needed. Make sure you give out cards with the address and such.
As to shooting, part of my problem with time to process is that I commonly shoot ~400-500 frames a game. Clearly you won't be able to do this so you probably need to ensure you get at least one "hockey card" type shot of each player on each team for each game. Or you simply shoot what you can and so be it. Also, you will no doubt get request s from parents to specifically shoot Johnny during his game. No problem with this...simply make sure you focus on all your request shots first and then do the rest second.
You will clearly also need another person to assist so that your booth and laptops etc can be manned while you are shooting the games. They can also assist at DLing (and processing and printing) the photos from the cards and making sure you have blank cards ready for the next game.
Keep things simple...some photogs offer specialty prints )e.g. mock magazine covers, etc) but again this means you need someone who can do this quickly in PS or other program and get it printed.
Obviously you will need to ensure you have lots of paper,ink,CDs, etc on hand and that the rink has a secure place (with outlets handy) that you can set up at and store all your stuff).
Hope that helps a bit. I have never attempted this (largely because of all the issues I discuss above, but I am contemplating it for the future).
Good luck and let us know how it goes (or not!).