Basically, you have your own niche. And the affiliate of your choice naturally should be related to your niche. Even though you can promote an unlimited amount of products that are relevant to your niche or blogs but be careful - Google hates too many affiliate links. Use it sparingly, especially if your site is still new and you don't have around 20 articles yet.

One way to go around with this is to write blogs inside WA under your own profile "with intent" to bring outsiders to WA. This link does not need to bear any affiliate link because it is your own creation and WA automatically knows it is you who bring in outsiders and when they sign up you are given credit by WA.

If you are confused or still unclear please read Kyle's blog HERE: Creating Content With INTENT Hope this helps,
Cheers,
Kipps

As many as you want...but be careful not to overload on similar products which will compete with each other...

Hi there Utdam,
You can have as many Affiliate products as you wish to promote. However, if your site is new, I would suggest as the training does to write some content in order to drive traffic to your site before trying to promote anything.

When you sign up with an Affiliate program, you will have a profile. You will see whether you have made a sale or not either through an email or visually like the item that has been sold and the amount of commission you will receive.
It's best to write reviews of products as blogs.

I love the theme you have used for your website. Simple and clean. Now to add some content.

Wishing you much success with your online endeavors!!