My question involves criminal law for the state of: Maryland

My scenario:
I was recently the victim of armed theft with a knife. I was very fortunate that once I gave up my stuff they just left me alone. With much thanks to the officers of harford county I quickly got my stuff back and the offenders behind bars. The crime happened not more than a week ago. I was doing research but I hoped for better answers from a live community.

I was robbed by two juveniles. They were also found in a stolen vehicle with stolen tags.

I was informed by the police that for this severity of this case these two would be tried as adults.

My questions:

1. I would like to know how long these guys could be going away for.
2. will I need to testify?
3. Should I attempt to press charges? can I press any charges? what charges could I press?
4. any other relevant information I should know about?

I have had no prior knowledge of how our punishment system works. I only knew the best ways to avoid getting hurt in the crime.