RSS is build in. You need to make sure that you have "Enable RSS Syndication" set to yes under the "External Data Provider" section in the options (Edit: looks like it already is). Then you should be able to access the feed through
http://fantasyhockeycoach.com/external.php?type=RSS2 . That will be for the entire site (any forums that can be read by guests), but someone accessing your feed can limit it to one or more subforums by adding &forumids=1,2,3 to the url.