If i was to sale my 2002 dodge caravan with 270000 miles run fairly well with some body damage what could i ask for?
13 years old, 270K miles, some body damage, you are selling what would be called a "winter beater." or a "beater with a heater" (assuming the heater actually works). Value ranges anywhere from it's worth as scrap (about $200) to its value as "beats walking." If you got 400-500 out of it consider yourself lucky. If the tires are decent ask a little more. If you want to get scientific, use any of the online blue book estimators, CarGurus has one under the "Research" link.
If it does not pass smog I would scrap it or drive it until it dies and then scrap it.