You've come to the right place. Check out the Rafflecopter 'Field Manual', which outlines the best practices of running a giveaway with Rafflecopter. Access the Field Manual by clicking here or visit http://learn.rafflecopter.com.
In addition to the field manual, the knowledge base / FAQ page here is a great resource to understand how Rafflecopter might work for you on Facebook, on your blog, how premium features work, what the entrant process is like, etc.
Finally, we constantly update the The Hangar: A Rafflecopter Blog. Check it out!