1. Navigate to Contacts>Individuals
  2. Click Advanced Search
  3. Expand Contacts->Financial->Payments
  4. Select First Transaction and click Add
  5. Set the amount to > 0
  6. Mark the checkbox for Transaction Type, and select Donation in the second drop down box
  7. Mark the checkbox for Transaction Date, and set the desired date range
  8. Turn on any additional filters as desired
  9. Click OK
  10. Click Run Query