I came across some ads about potential earnings using Adwords. How are you going to do it. I know that joining affiliates and promotion via Adwords are needed. But I don't know how?

Well i earn decently through adwords.
Just we need to promote our adsense websites / affiliate links through it.
But always calculate the CPC u pay with the CTR you get and also the Inflow/revenues you get back.

Any good links where we can get more info and tips on how to go about the entire process?

Nothing else can explain you more about it -
https://adwords.google.com/select/
https://adwords.google.com/support/?hl=en_US