Welcome to the Apple family, bro. We have a thread dedicated to Free Games:
Recommended AppStore Games for iPad, News/discussion/recommendation
As OCMAX shared above, Phone & iPad Apps Gone Free

You can also earn points and redeem for iTunes gift card worth $10. You can buy paid apps by downloading free apps. I've redeemed $15 last month and this month i have another $10 which means I no longer have to buy paid apps anymore. Its a really good and easy apps to use. Use this link to check out the apps Free My Apps

Here is another nice site that tells when a paid apps becomes free for a limited time: Free App A Day

Take note due to Christmas, a lot of good paid apps are going for free or at great discounts. Always keep in tabs of these great sites and you'll soon fill that disk space of yours in no time.

I'm interested to try, but I can't understand chinese words. Is it easy to navigate?