Although sarcoma can have some common areas with SCC in the head and neck, sarcoma is a different cancer, and may be treated differently than most cancers here, but I'm no expert. Surgery is the mainstay from what I understand, but some sub-types respond to radiation, chemo, and see targeted therapies being used. As suggested, ask your doctor any questions, get a 2nd opinion if you want, check out the top CCC, like MSKCC, and see what they're doing for different sarcoma's, join a sarcoma support/blog group also.
Good luck.