The only way we'd be able to help you is if you had a substantial deposit of circa 10% to 20%. So if you wanted a van for £5000 you'd need to put in £500 - £1000. We'd also need to see proof of 3 months income (bank statements) as you're classed as self-employed. Is this possible?
Even then as you have a very poor credit rating i can't guarantee we'd be able to get you approved. If this is not an option do you know of anyone who could act as a guarantor that you could add onto the application? Either way please make an application when you're ready and if approved we provide a no obligation quote and you can buy a car from any dealer. Kind Regards, Rachel