I will be travelling in late October to Nanjing and wuxi and need some advice on the planning:-

1. Which railway station has a shorter time to reach from shanghai to Nanjing? (Bullet train)
2.How to reach the railway station from Pudong airport?
3. How many days is require to stay in Nanjing? My main intention is to visit the buddhist temple, some shopping ,night/wet market ,food street and some tourist spot.
4. I intend to visit Niushoushan Cultural Tourism Zone. Is this place very far from the nanjing central/downtown? What is the transportation to reach this place and do I need to stay for a night?
5. Any recommendation of hotel for 3 of us which is easily access to the tourist spot?
6. How is the weather in late October?

Thanks