NYC Subway Questions (Routes, costs, etc..)?

Question

Hi everyone, here's a chance to get an easy "best answer". Answer my question completely and thoroughly and it's yours!

Ok, I'm going to NYC on Saturday. I'm taking a bus and it arrives at 49th and 6th. This is next to Rockefeller Center, correct?
From here I need to get to Chinatown, where is the nearest station, what subway do I take and do I have to change trains at any point? What is the best point to get off to be at the "heart" of Chinatown?

After Chinatown I need to get to Columbia University. How much time should I plan to get there, and again, give me subway routes.

Then I'm returning to 49th and 6th to leave. How much time should I give myself from Columbia to there so I don't miss my bus?

Also I need to know roughly how much I can expect to spend on subway fares for the mentioned destinations.

So I need specific information on stops, lines/routes, time, and costs. This will save me time since I don't have much to spare. First person to give a thorough answer gets "best.

Answer 1

I don't need your 10 points, I have more pionts( only 2 weeks to get level 3) than you but I can help you.
47 to 50th is RFC
B,D to Grand
1hr, B, D to columbus circle transfer 1
35 min back, same route
$7 day pass for unlimted ride.