Carol,
I believe you are making affiliate marketing far more complicated than it has to be.
I agree with nar321 only really try those programs that your really passionate about. Stay Focused.
You do not have to keep promoting an affiliate program. however if you are passionate about a program you will promote it over and over again.
As for deleting posts - don't!
I personally don't think you should ever delete a post on your blog, even if you make a mistake - just correct it with another post.
James