How can I arrange train tickets for traveler from Shanghai to Wuxi?

I want to purchase round trip ticket for one traveler from Shanghai to Wuxi (airport WUX).
He will arrive at Shanghai Pudong airport on 25July at 1215. He wants to take a train on to Wuxi.
He will depart Wuxi on 27July and return to Shanghai Pudong airport for an international flight that departs at 1700. What transportation should he take to get to Shanghai train station and how
much time does he need to allow returning to airport for international flight?
Thanks for you help!