Possible. IF the felony was for violation of a state law. You will need an attorney, and petition for a pardon, with restoration of gun rights.
Possible. You need an attorney to start.
Well, California doesn't respect gun rights, period, and if you've lost them, then the answer is probably no. That being said, we can't say definitively - we'd need to know why you lost them in the first place in order to do that.
Suspension of the right to own firearms is a Federal matter, not a state matter.
Consult with a lawyer familiar with Maryland state firearms laws.
Possible- depends on the individual case, what law was violated causing you to lose your rights, and where you reside. You will need to check with the courts in your state.
California traditionally has been among states with the worst reputation in regards to the rights of gun owners. So, short answer, yes.
Not usually. Normally, a pardon is just a pardon from prison, but the charge is still on your record.
It MAY be possible, it is not easy, and it DOES require legal advice beyond what we can offer here- you need to consult an attorney in YOUR state. It involves a restoration of civil rights, specifically including gun rights. The process and requirements vary from state to state- that is why you need a lawyer.
Start by contacting an attorney in YOUR state. Processes and procedures vary state to state, and this is one you WILL need professional legal help.
Hire an attorney.
No