A witness statement should always be sworn and notarized if using it for the purpose of prefiling determination of a prosecutor deciding whether to file charges or not against a defendant. I typically have witnesses that are beneficial to the defense state under oath by a court reporter transcribing under oath verbally their testinmony.. I do this because it is more effective in potentially getting a case dismissed.
When a person is arrested they post a bond to satisfy the Court that they will return to all court hearings. At the conclusion of the case, whether by plea, or trial, the Clerk issues a Certificate of Discharge of Bond to the surety (the person that posted the bond) so that they may receive the monies back. Most jurisdictions usuallt deductthe amout of court costs and other fees owed before returnig the bond monies.
A lot may depend if there is a civil no contact order still imposed. The Department of Agriculture can answer that question better since having a gun license is a privilege and not a right. You can always appeal.
Florida usually reports to all states. With respect to your probation, if you fail to report this to your probation officer in Illinois, they may use that as a basis for violating your probation as well. I am not an Illinois attorney and suggest you speak to one there before reporting to probation