You will have to retain a lawyer to get a correct, legal and current answer.
No. Not until a final adjudication.
If you are legally "Convicted" then Adjudication IS NOT Withheld....the whole reason for a Judge to have the option of Adj With is to stop short of convicting....IF you have a felony charge - and adjudication is withheld - you are not convicted....
If a person has a felony you cannot own a gun. It does not matter how long you have had the felony.
No
No
Yes
No. No convicted felon can ever lawfully be in possession of a firearm.
Never
No.
No. Federal Law says that anyone convicted of a Felony is ineligible to own a firearm under the Brady Handgun Violence Prevention Act.
No. If you are a convicted felon then you can not possess a firearm. However if the adjudication of guilt was withheld then you may be able to file to have the charge sealed and be eligible at that time to possess one.