What should be done to a car that s been sitting for a long time?

My parents bought me and my brother a 2001 ford mustang about a month ago. It has 88,000 miles on it and the previous owner (not the original owner) had been letting it sit for about 6 months I think he said. The car obviously hasn't been driven that much. I know I should obviously change the oil and all filters. I don't know too much about cars but am learning and was just wondering from any mechanics out there what all I should do to it.

Change or check oil and tranny fluid, spark plugs and wires, battery and battery terminals

As you don't know much you should take it to a shop and ask them to check it over. You're trusting the brakes work and the suspension isn't about to fall off. Once it's been sorted out you can learn oil changes etc as they become due.