Hi BiffMills, the warning lights could mean anything inc O2 sensor, ABS fault etc so it really needs the codes reading for a clearer picture.
Depending how quickly you want to sell the car it would pay you to have the warning lights checked before sale.
As for value, depending on the mileage, service history and condition anywhere between £2500-£6500.
Regarding the wheels, I recently bought a set of 18" LS430 wheels for £140 in need of refurbishment but it depends what size they are.
Hope this helps,
Andy