Get A Domain Name!
You can purchase a brand new domain name for about $10 from any domain name registrar you like, but one of the most popular is GoDaddy.com.
When picking a domain name to use for your affiliate promotions, you should pick one that is easily remembered, and also rich in keywords relating to SEO or search engine optimization.
The more keyword rich your domain (i.e. strongly related to SEO), the more likely you will be to convert sales and make more money.
Once you have your domain name, you should forward it to point to your hoplink affiliate link. This is called "domain forwarding". You can set this up from inside whichever registrar you purchase from.
Basically, the idea behind this, is that in all your promotions, like emails, classifieds, signatures etc, you simply use your own domain name. When a person clicks your name, they are automatically redirected to your hoplink affiliate url.
Domain forwarding like this will help disguise your affiliate link. People do not like seeing long, scruffy affiliate urls, and are reluctant to click on them. So by using your own domain name, you are massively increasing the liklihood of a person clicking and purchasing from your link.
You WILL make more money using domain fowarding that if you use your standard affiliate url.