Others linked here are highly recommended because of the quality of their products as well as their associate programs. They may have a small charge for a membership package or other program requirements. It can be as simple as e-mail. STEP 2 - The merchant tracks those visitors. STEP 3 - If your referrals buy, you receive a commission.
Affiliate programs are do-able.
No need to develop your own products. No need to worry about order-taking and shipping. No need to worry about credit card accounts or collecting sales taxes. It's an intensive 5 day e-mail course on becoming a high earning affiliate champion. Visit here often for new additions and other FREE services offered.