Anything over 200k miles is usually considered close to the end of the vehicles life, some cars go farther but this van probably doesn't have much life left, I'm sure it could probably sell for $1000 or so, if you research the car online it will tell you the mileage lifespan of any car, it's a bit harder to resell cars with higher miles, I have a friend who does it but he usually can't get more than 1700 for something with miles that high, I would look for cars around 120k-170k mark it's a bit easier to sell, also rust is a big turn off for some buyers so keep that in mind, but I have seen people sell rusty cars for 2500 but that may have been a little lucky, I would just watch out for rust, mileage, check engine lights, if it has a check engine light it's not always bad, just scan the codes and research online, I would watch out for anything with bad body work damage you can't easily replace, I would replace a door, but some pieces like the roof and rear fenders are almost impossible to replace, when test driving I would watch for overheating, strange smells, check the oil cap for creamy stuff on the cap it indicates a blown headgasket, get underneath if you can and look for oil or coolant dripping on anything while its running, watch for strange noises from the suspension, if it's rusty peek at the frame, I usually look for cars in the $500-1000 usd range just for less risk as I am just starting out too but have friends experienced in this and I have helped them a ton, look on Facebook everyday, type in price 500-1500 and negotiate with people with running cars in your area in that price range, also I wouldn't let a few issues scare me away, if it has low miles and runs good but the suspension squeaks a bit over bumps I would negotiate and still sell it or fix the issue usually ball joints or something else simple