In response to your question, I think that you would waymark either the home field of a club if they are lucky enough to have one, the field that a team plays on if they are part of a "pub team", or if they have several then I would leave it up to the poster to pick a suitable location. Let me give you an example:
AC Milan is one of the premiere clubs in Italy and they are getting some press because of the David Beckham deal and being shown on ESPN with their increased soccer coverage. Their home field is San Siro a stadium in Italy which they share with another club in Italy, FC International Milan. Waymarker X could make a waymark for the club by taking pictures of the stadium and marking the coordinates outside. Whether Waymarker X could also waymark this stadium for FC International Milan is something that the group would need to get some input on.
This is all just a thought so join the GOAL group and you can help shape this category.