Be honest with your readers; make sure they are aware that you make money when they purchase off of your affiliate links. You will lose the trust of your readers if you attempt to hide or obfuscate your affiliate links. If you are up front about your intentions, people will trust you and return to your site, which means more chance they will buy something from one of your affiliates.
Your goals should increase as you get better. Reach for the stars and put in hard work every day to watch your profits increase regularly. It may be difficult to invest the time and patience at first, but in the end, it will be well worth your while. Have your audience in mind when you are ready to choose your affiliates. For example, if you sell something to wear, it makes no sense to work with advertisers that sell kitchen cleaners. Potential customers who visit your site are looking for certain things and have a reason for their visit. Your adds should target their needs and use their interest to your advantage.