Example expenses could be: buying/printing scorecards/fliers/marketing for events, maintaining a set of "unmarked" dominoes for events, money for event prizes, venue rentals, maintaining a website, etc...  This likely wouldn't be set in stone and could be adjusted as necessary as the group matures.

Obviously these are still large areas and dependent on where the final venue is.  Trying to find where interest is grouped based on where you live or work.