Make sure to give them an accurate description of the amount of furniture to be moved. If you can email a piece by piece list that is helpful as well. Include any patio items and garage items too. Pianos and hot tubs will be extra in most cases. Make sure to mention this to your coordinator.
Make sure to call a mover 4-6 weeks in advance & schedule. Waiting for the last minute may result in you not finding a mover.