1. What To Promote ->
Do NOT promote everthing. Its very easy to get carried away and want to promote many different things at once especially for beginners . Make sure you are very selective and do a thorough research on your niche and product. Zoom in on your niche and pick a targeted market. Make sure they are fulfilling a real need or want for your audience.
2. Check Stats ->
You dont have to keep your eye on your stats every minute of your waking life but keep your eye out to see which products work and focus all your attention on those instead of wasting time on the ones that aren't making you any money. Click through rates are important. They will show you how many people have clicked on your site. If your click though rates are high but you have had no sales then you know you should change something on your site to make it more presentable. A landing page , blog , etc.
3. Promote different ways ->
You have to take action and find different ways to promote your product. Dont expect to copy a banner on your sidebar and expect money to come rolling in. Posts are great when they include links. Be sure to give your audience a thorough review of the product explaining the benefits before just sticking a link that has nothing to do with the post's content.
Good luck to everyone .