Monetization and marketing research

Hi! Last few days i was researching about monetization, ad networks, marketing, in-app purchases (IAP) etc. And i will continue. Already learned a lot, have some game-changing ideas.

As currently im working on my first game, looks like it will be a learning ground also for me - i will try to implement all the stuff i learn.

What i have in mind:

• use TapJoy, implement some sort of currency, that user can use to get consumables/permanent boosts.
• must implement IAP
• coins/items for inviting friends, for sharing scores, etc. 

Huge potential in this stuff. Only question - doesnt this violate GP ToS? How the user will react? 

So much to research yet. Also case studies of the top grossing games must be done. I feel like im discovering a whole new world, besides the one that consists of writing code.