Announce your winner with email. Send an email to everyone who enters the contest. List the winner and invite the recipient to enter again. Keep the email fun for your reader. Make it human, make it short.
Email is the key to successful Internet promotion craft it carefully.
Use a database. You will collect many names and email addresses. Use a database program to manage the contest. You need to compile, sort, cull, and back-up the entry data. These are easy tasks with a database, very difficult tasks without one.