The good reason to join reputable affiliate programs is -They teach you everything about online marketing. Basically they give you a back office with your account information and they give you a couple of splash pages and links after they will arrange an Affiliate manager to help you to make money. Affiliate Manager will inform you with latest offers, High converting offers and Seasonal offers that should you try. AM (affiliate manager) will also tell you the sources where certain offers work well, If you maintain good relationship with your AM.

Although, I will not give you brief details about how to and where to earn money with affiliate programs but certainly it depends on the offer you choose.

Double check if you have joined below networks or not!

• Clickbank - well-know marketplace for affiliate and merchant. Choose high gravity products or product with good gravity.
• CJ - my favorite and very old affiliate network with top branded offers. Always search for EPC (Earn Per Click rate) when you join any advertiser. This will help you to promote any advertisers perfectly.
• AZoogle - another well-known network in the industry with top offers and high payouts. Affiliate managers are high educated and caring. They help you to make more money.
• Adsmarket - Very good network for international affiliates. Support is fair and payments are sent on-time. They do offer weekly payments.