How do you promote links? How do promote big sites too with a lot of merchandise? Do you redirect from domain names? And why are ther no full landing pages for most merchants? Thanks any help

That's really way to broad of a question to give a good answer. The best thing you could do is read through these forums to get some ideas.
White Hat SEO forum
CL forum
FB forum
Black Hat SEO forum
Making Money forums

There are many, many different suggestions about how to promote a site in all of those forums. The whole purpose of BHW is to answer that basic question, as much as you want a direct answer you're really going to just have to browse through everything to find ideas that might work for you.

Can you just tell me now how to do the code for individual products with text links? I just took half hour to put three product links on a page where I had to encrypt the page update the image code then paste all four blocks of code into the page as it said if not put all four in the link might not track