Whether your own products or affiliate from Clickbank, Amazon or Linkshare, you can promote them on Twitter. Here's a few simple thing you should know before you begin.
1 - First and foremost, the most basic rule, have an account on Twitter. Rest assure, registration is free.
2 - Start by tweeting subjects, topics or anything related to the niche of your products. Don't rush on selling and just concentrate on that. Tweet on free items or tips as well. Don't be a robot tweeter, interact with your follower.
3 - Don't just focus on one product and continue to promote it over and over again. Your followers will get bored and unfollow you.
4 - It's better if your link brought you to a blog or site instead of the affiliate website. For me, it's easier to blog instead of building a website. Just use free blogging platfrom like Blogger or Wordpress if you want to test the market first.
5 - If your tweet re-tweet by others, thanks the person by send a tweet with @ symbol (ie : thank you @person name) The person would feel appreciated.
Good luck~~~~