PuDong airport to Shanghai Railway station

I will reach at PVG T1 at about 1am in the morning and have to go to Nanjing. Its my first visit to china. Please guide me how to proceed? May i take Bus line 5 from Terminal 1 and directly go to the main Railway Station, from where i take train to Nanjing or any other easy way is available?
If i have to take Bus line5 from T1, then how i reach to Bus from International Departure Exit.

Please reply soon.
Regards