here's the link to the Decamp schedule - know that the Roseland bus route #66R does not run on weekends. The #66 does run on weekends, however.
Check out their routes from W caldwell - the #33 line and also the #66
As far as parking along the Roseland route (which is basically Passaic Ave & Eagle Rock Ave), there isn't any designated lot along the way.
There is a very large parking lot at Stop and Shop (formerly Kings grocery store ) where the route originates, on Bloomfield Ave., near Passaic Ave.
You might want to verify this, but I believe you can park there.
Another option is to drive 10-15 min to the S Mountain Arena on Northfiled Ave. in W Orange and make use of their multi-level parking garage - you will also have the convenience of more express routes in the morning - check out CoachUSA for their schedules (bus #77).