Diagnosed with a new cancer

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Well..I've recieved news very recently that I have cancer once again. It really did come as a huge surprise being that I have been in remission for 7 years, but then again I knew it could be a possibility being that I had cancer before. My first diagnosis was Soft tissue sarcoma under my right arm. Apparently it was a rare form of it, and it was aggressive. I received both chemotherapy and radiation therapy. My doctor seems to believe that this new diagnosis was most likely caused by my radiation therapy since it was near the same area. So I am really in shock, would love it if people can help me answer a few questions about this new diagnosis. A few facts:

-I was 10 and a half years old when I was first diagnosed. (Now 18)

-My new diagnosis is: Grade 2 (Intermediate) Osteosarcoma.

-I start chemotherapy on Dec. 3rd.

 

Questions: ( I searched on the internet, didn't get much help)

-Its been awhile, so what are the do's and don'ts during Chemo?

-What does Grade 2 mean?

-Suggestions for boredom while i'm in the hospital. 

-Anybody that has/had Osteosarcoma?