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1. I learned B1 is for business purpose and B2 is for travel. I haven't found any business. So, my only option is B2, right?

-Yes.

2. How long does B2 visa last?

3. What documents do we need to submit if we apply for B2 visa in United States?

4. Is I-131 the correct form to fill in? Doesn't seem to me like the correct one.

5. Can anyone give the link for B2 application form? I searched, but didn't find the correct one. I also found a link like this https://www.visapro.com/signup.asp. , but not sure if I need to proceed. This is a company webpage, it seems to me.

6. How much is the fee?

-Do you want to change your status to B-2 within US or apply for B-2 visa stamp in the US Consulate outside US (e.g. in China)? These are two different things.

If you want to change your status to B-2 within US, you need to file I-539 to USCIS. See this website:

http://www.uscis.gov/i-539

If you want to apply for the B-2 visa in China, then you need to check the website of the US Consulate in China.