Can I create a bunch of people accounts by importing a list?

Yes you can.  We offer an import tool that allows you to upload a CSV (comma separated value) file that WorshipPlanning.com will use to make Helper accounts.  The CSV file must conform to a template we have specified.  To find a sample CSV file and see how to import it, watch this brief video tutorial: http://www.screencast.com/t/pT5NODhSDHy