First newbie tip:
When you are looking at offers on Hydra Network, make sure you look at how you are allowed to promote the advertisers product before doing anything. If you don't, you might end up paying a lot of money and get nothing for your efforts.
For instance, in the Automatic Toilet Cleaner affiliate marketing study, I had to make sure that the CPA offer allowed me to promote through both Search-SEO and Search-PPC. In order to check this, I looked here:

Hydra Network Offer Overview
So as you can see, I am allowed to promote this offer using both Search-SEO and Search-PPC, provided I did not use the search keywords they listed below the offer in bold.
If you pick a CPA offer that does not allow you to use Search-PPC, and you run a PPC campaign using Adcenter or Adwords, you can be denied payment for any sales that you make - effectively, you have flushed money down the toilet. Be sure to read through CPA offers and follow their rules to the letter to help avoid being denied payment.