Nokia :: N97 How To Download (for Free) Apps / Games?

i went on the ovi store and realized that i had to purchase the games and apps. so then i went on another site and download stuff instead, i dont really trust anyways, cos it say it might cause harm to my phone, btw, the download doesn't even work! can someone tell me how to download game and apps and store it in my phone in the correct file
and such.AND the face book app thingy in my phone doesn't work, whenever i click on it it says no internet connection, when there is, cos if i click on google, then type in facebook and log in then it works, but not directly to the facebook app originally there when i turn on the phone.