A bit of suggestion for my nokia phone?

[Joydeep]

My phone is nokia 5610XpressMusic so lets begin with the questions.
1. Is this phone java or symbian.? If symbian, which version
2. Some websites to download apps and games through phone?
3. Some apps which should be on my phone. Like video downloader, messengers, browsers and etc.
4. Some links for mobile antivirus which will surely work. I have tried using but it comes out something else.
5. How to protect my phone from virus, spyware, malware etc.

Thanks a lot in advance