Did you buy it from a Trade Sales dealer? Quite often they don't have books because they are ex-lease, imports etc etc.
You should be able to get a new service book and handbook from your dealer (presenting the bill from to the dealer you bought it from), at such low mileage it won't have been serviced yet I imagine so that won't be a problem.
The Service and Airbag lights clearly suggest a problem which the supplying dealer must put right at their expense. I imagine they would argue that the dent wasn;t there when you bought it or else why didn't you point it out.
I'll try and dig out some links that have been previously posted about your rights when buying a car from a trader and post them here, the law is on your side.