notroubleclubber

Ive got a d plate mk4 cab. It came with a roof on but this is mouldy and has a few rips. I was also given an immaculate roof but due to work and weather havent put on yet.
When i got the car, inside was soaking (carpets tho seats were ok), i just thought its prob roof leaking.
Since ive got it home ive kept it under a cover but when it it today and its still absolutely soaked inside front and back and the seats are wet too.
How can i get this car dry and kept dry. I know putting the new roof on will help but what else will need replacing? and where do i get the parts?