Getting some Bitcoins for free:

Get some bitcoins to start testing, how this all works, below are some services that offer you bitcoins:
BitVisitor -  Earn bitcoins in exchange for visiting websites, lasting 5 minutes or more!
BitHits - Daily BTC's payouts to your address
Daily Bitcoins - Send small amounts of bitcoins to your address.
CoinAd - Bitcoin giveaway faucet, also lists some offers.
BitCrate - Break a crate and get free Bitcoins!
Bitcoin Addict - Another Bitcoin giveaway site.
Earn Free Bitcoins - Earn bitcoins in exchange for visiting websites for a designated period of time. 
NetLookup - Send bitcoins straight to your wallet address.
Bitcoins4.me - Enter your Bitcoin address below to receive small amounts free bitcoin.