You call the Maryland Governors office and speak with an aide, they will send you a packet with the paperwork to file. Make sure you provide every detail requested so you can expedite the process.
If you are asking about a Governor's pardon - you should write a letter of request and explanation to the governor setting forth the reason(s) you believe the offense should be considered for pardon.
There are so many agencies out there but you need to make the best decision for yourself. I strongly recommend IPC Pardons & Waivers. They are a smaller agency but they provide confidential and...