Set up an appropriate time for a (phone) interview with each candidate.
Create an interview questionnaire for the interview and a basic rating sheet.
Be sure that you create questions that cover your key criteria (check willingness to travel, work on weekends etc. if required).
Make sure that an introduction to the organisation and the work you do is part of the interview, as the purpose is to figure out for both sides if working together would make sense.
Create a shortlist for the next interview round based on your ratings.