To confirm the painting contractor you have selected is licensed by the MHIC, please click the Baltimore County link.  You will be able to confirm the contractor is properly licensed and insured in the state of Maryland as required by the Maryland Home Improvement Commission. 

The Duron Paint Calculator is certainly a good resource in getting a "snapshot" of what your home painting project would cost.

The Sherwin-Williams Paint Visualizer will provide a nice starting point for color schemes.  Also, any reputable painting contractor will provide color samples to get an idea of what the color looks like on the painting surface.