I really don't think that you need to be concerned with building your yedda page.  Just get involved.  List your topics of interest, ask any questions that you may have, scan the other questions for one that interests you and answer it if you feel so inclined.  Don't be shy.  I've seen some pretty silly stuff.  Once you start, you may not be able to stop.  It will happen REAL fast.  It would be nice if you kept a dictionary handy or used spellcheck.  Being an old fashioned guy, I do not bother with spellcheck.  I recommend Webster's Third International (written by someone I know).