Your domain is the address for your website (e.g., www.affilorama.com) so this is the first thing you will need to do when setting up your site. Considering there are millions of websites on the internet, it's possible that the domain name you want may already be taken by someone else. So make sure you have several options in mind. Be sure to read our advice on how to choose a good domain name.
Be sure to check what kind of customer support you can expect from your affiliate program once you have signed up. Do your research online and if possible, speak to other sellers using the program to get their thoughts. Can you speak to someone via phone or Skype or do you have to wait 72 hours for email responses? Be clear on this because trust me, you will need support at one point or another.