It's never too early (or too late) to play with ideas for your clubhouse. If you want a clubhouse, draw a picture of it. It doesn't matter how crude or crazy the drawing is, but doing it gets your brain focused - and it's fun!
When I was about ten or eleven, I drew some fantasy clubhouses...
a combination clubhouse-treehouse,
a backyard clubhouse with garden-hose privileges,
and this beach clubhouse made of driftwood.