It doesn’t matter if you are building a new website, or creating a PPC Campaign, you will need to do some keyword research. I suggest you do some brainstorming first. Think about all the different things that someone could search for that could possibly lead them to you and your website. For example, if you are selling an e-book about affiliate marketing on the internet, you may come up with a few different types of keywords to look for. Here are a few examples (ranked in order of probable conversion rate).Affiliate Marketing E-Book - obviously
Affiliate marketing - may not looking for an e-book, but could be persuaded
Internet marketing - someone that knows about internet marketing, but may not understand how affiliates work.
Work from home - Affiliate marketers can work from home, so this applies to them.
There are tons of others, but for the sake of time, I’m cutting it there.
There are a number of tools available to help you with your keyword research. Some are free, but some are paid.
Paid Services (some have free trials)
Free Tools
SEO Book - Go to the tools link
This is not a complete list. I will add others as time goes on.