Aside from finding your support crew through your friends, families and people who just show up even though they don't know you, there are organisations out there designed to support you in a way that others may not know how to.
There are lots of great support groups on facebook but always do your due diligence with the information you find. You can search GBM or Glioblastoma or whatever the name of the cancer is on facebook to find other groups these are the ones we joined.