Anayeb, they should have already been advised you about the relocation policy. If they haven't then make sure that you ask before signing anything. They allow a shipment weight for personal effects (it used to be be 1,000kg including packing) but may have been reduced since I left.
The topic of medicals is covered elsewhere on this site.
As for furniture, you will receive a furniture "grant" that is worked off over 4 years plus an interest free car loan that is paid back over 3 years. Ask for the book "Destination Qatar", if it has been updated then it will help yu.