want to book G7501 to go to wenzhou.

Time of G7501 is morining 7:00 . To get this train i want to come station at till 5:30. i am afraid that taxi will not run in shanghai to get station at morning 5 or 5:30 then how i will come to this station.?
Is there stay facility in hongqiao railway station in night so that i can stay in night in station.If hotel to stay is available in station then we have to book advance.?

Please suggest what i should do.

If i book ticket then i have to collect it at railway station. Can i collect ticket 1 or 2 days before or we have to collect at same day only. what is time to collect ticket and from where.