You already know your best and biggest donors! Any professional fundraiser will tell you: Donors know you or your team, they know your project, or they know your community. Your donors will come from your network and your fundraising team's network. This is why it's so important to build a committed, diverse fundraising team: your network will be larger, stronger, and able to bring in more donations!

For more on building your fundraising team, see: Step 1: build your team, plan your asks.