Am I entitled to VA benefits/compensation after only 1 year of service if I get medically discharged?

Depends. If the condition is something that was not pre-existing then probably. You will figure all of that out during the Med-board process.

yes. get in touch with your state VA. I have found them to be more helpful that DAV or any other service organization.

Be sure to get and keep copies of ALL your medical records while in service, after you are out anything in "official records " can be gotten but it takes time.