What to do before joining an Affiliate Program

You want to join an affiliate program to earn some extra cash :)

So you've found something interesting that makes you wanna be their affiliate.
Things you should do !!!
Before you go into a deeper research of the quality of the program,
the percentage, the comments and reviews from other affiliates,
before reading the Terms / contract / Rules, etc

You should just check whether your country is eligible for joining that affiliate program.
some may require you to click on the "sign up" button and on the contact information form, check whether your country is listed there.
Sometimes, Not all countries are listed.
and if your country is not listed, you don't have to spend useless time researching about that affiliate program.

But if you've done your research prior to signing up, hey, at least you can blog about it and let other people know :)