New guy on the block has a couple of questions

I have set up a test shop in Zen Cart and have been surprised by it's flexibility. I have added images and downloaded price / stock details etc and now want to integrate it to a third party order processing system. So here we go

1. After taking the order in Zen Cart I want to authorise the CC without charging the customer - I know that can be done

2. Extract the sales orders from Zen Cart in a file (preferably csv)

3. Process the order through the 3rd party software and on despatch of the goods send a file back to Zen Cart to authorise payment of the CC

4. I am a UK account can I set up Worldpay via Zen Cart- is this better than Paypal - please discuss.

5. is it possible for address details etc entered in Zen Cart to populate the same fields in the payment module or do they need to be entered again

Thanks in advance