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Is it at the end of a certain period they go back and refund your account with any fraudulent click charges, or do the clicks just show up in the Manager with no cost ($0.00)?
Any help would be great,
Don't hold your breath waiting for any significant refund from Google.
Since you mention being new, you may be interested to see these four pages (from among others) in the AdWords Help center, which will give you some basic info:
How does Google detect invalid clicks?
How does Google respond to instances of invalid clicks?
What kinds of clicks does Google consider invalid?
How will Google credit my account for invalid clicks?
Excerpting a portion of the last page page mentioned above:
[...] If we discover that you've been charged for invalid clicks in the past two months, we'll apply credits to your account. [...]