From 1st to 21st birthday parties, the ideas of the party is always the most fun thing to think about. The planning, not so much. Download my printable party planner and print it out. Jot down all ideas, planning stuff, people who can help etc.
I also offer party collateral designing with print instructions! This includes invitation design, stickers, posters etc. Choose the party packages and get that part going while you plan the rest!