Go along to your local auction, do not buy.
Then digest what's going on , return when your happy what your funds will buy.
Try a hunt in Gumtree see what's available .
On older cars it's all about condition, make tyre, check the MOT history via the govt website.
Never overbid at auctions & if in doubt walk away. There are 100,s of used cars out there. Good Luck.