Affiliate Marketing Secrets

I want to start an affiliate website-meaning that I will put banners of other peoples products on my website-if someone clicks and buys-I will make a commission.
I have the code from the banners-but when I try to copy and paste it-i just keep getting the code,not the banner-how do I put the banners on the website?

I want a tool where you can paste in words and it will tell you how many words it has. I know there are a bunch of them already online, but I want one that I can put in my website. P.S. I’m making a website with tools for affiliates. Any other ones I should put in? And is there anywhere I could go to get the html codes for these tools to put them into my website?