Earn As Much Money as Possible... How?

Maximize Visitors
The more people that see your ads, the more will click and buy. Some ways to maximize visitors are:

Add more content and pages to your website
Optimize your website for search engines
Get more links to your website
Advertise your URL in Google adwords and pay per click search engines
Advertise your URL offline in classified ads
Maximize Click-throughs
Pre-sell products with reviews, articles and related information then provide links in easy to find places.

Maximize Profit
Adjust the selling price to balance sales volumes at the point where maximum profit is produced.

Minimize costs by reducing shipping costs and administration costs. One of the best ways to do this is to market digital products such as software and e-Books that don't require physical shipping.

Maximize commission. Look for large commission percentages and high conversion rates in affiliate partnerships.