Tresping Question ??????? help please?

Ok I went to court today and I had a stupid curfew charge from a year ago and the judge wanted to check up on me. So he saw my tresping charge. (my two friends and I went to a old run down hotel that has black mold in it and stuff like that and people have vandalized it or partied in it many of times according to the cops. But we went in their and broke gl with a baseball bat and when we came out there were cops and they made us get in hand cuffs because of the bat. Which I understand. But I was only charged with tresping that's it. And I was told that the building has been for closed and they have had cases involving the building before and the owner does not even show fo anything.) But at court today the judge asked me if I knew how many years you can get for tresping and he told me up to 12 months. And he told me I need a lawyer and to take this serious which i am and you always need a lawyer for any case in court. This is my second thing on my record and I just turned 18 and don't plan to screw up or anything. The judge moved the curfew violation to that date to so I have both charges on that day.The judge said I better not screw up from now to the time of my court date. and he said he do sent want me to blow my life. My mom said he was scarring me with telling me I can go to jail for tresping. I'm guessing you can but my record is not a mile long and I'm not a kid who gets in trouble really. I just did a stupid thing with my friends not thinking. But I wanted to ask if you think I will get any jail time. I was told its very highly unlikely and what do you think I will get or happen. Thank you for your answers. And you don't have to bash me on here i'm just looking for some help I know I did something stupid and I have changed my life alot ever since I got into trouble but thank you anyways. And what are some things I could do to show the judge or court i am not a screw up because they don't know that they get kids all the time for things. (Virgina state court law)