How to sell a car ?!

One day you'll sell your car may be because its problems or you just get boring of your old car ,but many questions pop up at your head just when you think about selling your old car . How to sell a car ?!
• When should I sell my car?
• What is the value of my car?
• Should I sell it privately or trade it in at a dealer?
• How to get out of a lease early?
• How to prepare your car for sale?
• Where to advertise your car?
• How to close the deal keeping the price high?
• Bill of sale - things you need to know
how much you should sell your old car for? where will you advertise? & many other questions that are common between people thinking about selling their old cars .. here we'll try to find the good answer for you.