If anyone has a guide on how to provide a bitcoin exchange for my webstore or even wants to help me on the project send me a message.
You are describing and exchange but what you are really describing is an online store selling in-game currency and vouchers/codes, correct? (e.g., similar to what this likley competitor of yours does:
http://bitcoincodes.com then click Gametime for pricing ?)
If so, then what you are probably looking for is ecommerce / shopping cart software that supports bitcoin as a payment method. It looks like you've already got a shopping cart functionality on your site. Which software are you using? Perhaps there's a bitcoin module for it?
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http://en.bitcoin.it/wiki/Category:Shopping_Cart_InterfacesFor instance, for OSCommerce there is a Bitcoin payment module:
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http://bitcointalk.org/index.php?topic=67166.0;allThere also are merchant solutions from Bit-Pay:
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https://bit-pay.com/ecommerce.htmland from Mt. Gox:
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https://mtgox.com/press_release_20120306.html