Try starting out using an eWallet, such as MyBitcoin: http://www.mybitcoin.com
Then buy your Bitcoins with PayPal here: http://coinpal.ndrix.com use the bitcoin address generated at MyBitcoin. You'll get your bitcoins in less than an hour at MyBitcoin.
Then those bitcoins can be spent using your example, at StrongGames.
The fundamental problem I have with Bitcoin web transactions is that it requires trusting the other party, since I can't exchange the goods at the same time. How do I make that determination and what recourse do I have if I'm defrauded? This would seem to be the fundamental obstacle to adoption to me.
A transaction is basically three pieces of data: private key signature of the sender/payer, public key of the receiver/payee, amount of bitcoins.
The blockchain is very difficult to counterfeit, so theoretically a site like MyBitcoin.com can't actually 'control' your wallet or transfer all the bitcoins to themselves, at least without all the private keys of their depositors.
"...If the block count in your client matches the one shown at bitcoinwatch.com, your client should already show the transaction. Otherwise, wait for the two block counts to match..."
My block count says 51,486 but the one at bitcoinwatch.com is over 100,000. Why aren't they the same? Will they be?