Hi equilibrionist,
Welcome to 5 star. Congratulation on your speed typing talent and I will try to answer your queston as best as I can.
1) you can try register at:
affsphere.com
associatedcontent.com
Those are something I got to know online and I didn't use the service. So it is up to you to try it.
2) The simplest process I can tell you is that you can sign up as an affiliate, write an article related to the product, post your affiliate link in the resource box and submit your article to the article directories.
Bear in mind that a lot of article directories will reject your article because you are using an affiliate link. You can try to link to your blog (free to setup) and link to your merchant from there.
3) If the merchant track their traffic, they will know but they won't know someone bought their product because of your article unless they ask the customers (at least I think). But personally I don't think that is important to you because you should be worry that they know who they should pay to.
4) You can try these tools to look for your keywords:
Seo Book Keyword Suggestion Tool
Free Keyword Suggestion Tool From Wordtracker
Keyword competition is generally marketers competing on the keyword that most internet surfers are searching for. Try "affiliate marketing" on Google, the competiton is 12,900,000. You are competing 12,900,000 competitors and it is hard to win over them.
It is best that you target long tail keyword to start with. Pick a keyword from the tools and drill down from it. Let's take affiliate marketing as an example, the word tracker count for it is 320 but the "afifliate internet marketing" only have 8 searches and competition on Google is just 1,320,000. It is still a lot but is far less than 12,900,000.
I hope I don't confuse you about that.
5) I am afraid I have to be honest with you as your typing skill is different with article marketing because article marketing is about writing informational articles and have them in front of potential customers. You can only save time with your speed typing skills.
I am sorry to tell you that if you want to earn money from affiliate marketing, you do need to invest time, effort and money. You need to give the business a try because you can find more ways to save your time, money and effort.
You can earn a steady income in 6 months but that really need a lot of investment on your side especially from your motivation and effort.
The basics to finding the right product to promote is to look at your interest and skill. Maybe you can try to look for products about speed typing. If you can't find it on paydotcom, you can try Goole it by "your keyword + affiliate"
Hope that helps.