Below are some useful websites for flights, car hire and travel insurance.
Please note you will need a credit card to pay for your car hire it is hard find one that accepts cash or debit card.(switch/ maestro card)
We have used a few ourselves. Just click on the link to take you directly to the site.
When you hire a car just check if you have to pay extra for petrol for example carjet.com will charge about 40euros to fill a tank and some smaller cars only take 25 euros to fill them, so thats a nice profit.
Recordrentacar.com may provide a higher quote but you take the car with what petrol is left and you bring it back with the same so in the long run could be cheaper.