NEVER take delivery of your new car in the evening!!!
1st thing to do is check proper operation and orientation ride

most salespersons want to sign all documents before checking out your new vehicle). DO your pre-inspection 1st, if all is agreeable to you then finalize the paper work.
Check the operation of all equipment--especially any items that the dealer may have added.
Check for dents, scratches or mismatched paint. Even brand new cars can have paint defects.
Check the interior--fabric, carpeting and make sure that you look up at the headliner.
Make sure that the owners manual, service schedule, and warranty book are with the car.
Look at the odometer to make sure the "new" car you're buying isn't actually a demonstrator. New vehicles should not have more than 100 miles on their odometer, unless it was obtained in a dealer-to-dealer trade.
Review procedures for the service department--how appointments are handled and who to contact if you need service.
Check over all of the financial papers and the sales contract. Make sure that they match the figures that you and the dealership agreed on. Confirm that no additional items (and costs) have been added.
If anything is not right, either get it fixed on the spot or, if that is not possible, get it in writing and signed by a manager. If considerable additional work is needed, leave the car without signing any contracts or financing papers. If you need transportation (for example, if you have already sold your old car) insist that the dealership gives you a loaner car while the work is done to yours.