If you go free fall, you WILL attempt to swim back up to the plane immediately after jumping out. You will also be surprised how cold and thin the air is (I jumped at 15,000 feet) making it a little hard to breathe. Once your chute deploys it's instant silence and fucking beautiful.
By the way, you'll have 2 chutes with the emergency one hooked up to your altimeter and set to deploy automatically at 1,000 feet in case you're not able to pull the chord yourself.
Pay the extra $50 to have someone jump out with a helmet cam so you can get it on tape.