Just some pointers you may find useful ;)

When you research on what affiliate programs to go for, always take into consideration the market you are targeting - as they are the ones who will make the conversion on your site. Also, always try to pick one that you you have knowledge on. Providing more than the product itself is a big plus - useful info, good advice and post sale customer support will give you more customers via referrals.

After that, it would also depend on how you market your product to the right market. This is also a factor to be greatly considered in determining your success. IMO, when you want to earn big, you should be ready to spend for it as well. ;)

I always opt for PPC to reach my target audience. Knowing how this system works would work to your advantage. Research (keywords), Selection(keywords and PPC provider), Implementation (bidding and start-up) and Analysis (which keywords worked best and cost vs. revenue).

How do you choose you affiliate programs/services and how do you promote them?

I normally do a research on the company or program I intend to join.

For instance, Is the company a debt free company and the number of year it establish or exist. This will show the credibility of the company itself.

The next thing I will look for is, is there any big name guru joining the same program? If there is, most likely the company or affiliate program is safer to join.

However I will normally choose an affiliate program that offer passive income,
because I do the work once and I get pay monthly.

To Your Affiliate Success