Baltimore is perhaps not the best place to be for sport climbing. For a 2 hour drive, you can get to Birdsboro Quarry. The area is actually fairly well developed with nice little benches you can sit on. Its blasted walls sometimes still shed rock - careful.
The area has tons of short & sweet sport routes, and some longer ones if you like to do 5.11+.
Jenga is a fun one to get on.