If you are interested in buying a new car then chances are you will have to either sell your old car or trade it into a car dealership. More often than not it is much wiser to sell your car privately to get the best price which in turn can mean you will have more money to spend on a new purchase.
One of the first things to do is to get some photos of your car. If you don't have a good camera borrow one, a good photo is worth a thousand words. You can also look for companies that buy cars via https://autobuyersgroup.com/
Choose a nice dry and bright day to take the photos and get some shots of the interior and exterior. A good tip is to take the photo on a flat level with something neutral in the background such as a wall or hedge.
Even if you are part exchanging your car it is wise to spend some time cleaning up your car so that the dealer can see that it is in good condition and looked after and in return you may well get a better price.
If your car is worth a great deal then it is certainly worth spending some extra time and maybe some of your own money in advance to get items like alloy wheels cleaned and bumper scrapes repaired and tidied up.