Where do we get on the bus at Newark NJ to go to Detroit?

Newark Penn Station . Greyhound Terminal

I would like to take a bus next Friday afternoon or early Saturday morning to Baltimore

If you go to any information desk at Newark Penn Station, they'll probably tell you to go outside to the Greyhound terminal, at the corner of Raymond Boulevard and Raymond Boulevard West.

Raymond Boulevard and Raymond Plaza there is a greyhound stop

Nj not sure not from Jersey but you can look it up on the net or call greyhound