Last Minute CO2 Questions

[Overgrowth]

I'm about to get my 5 LB CO2 tank filled up, and I just want to make sure I don't have an accident. Here's a picture of my setup (yes, I do have a CO2 washer in between the regulator and the tank):



Here's the needle valve:


Okay, now I have a few questions:

1. Does the airline tubing just hook onto that little plug on that needle valve?
2. Do I just take the CO2 tank to the store, or do I take everything with me?
3. How do I safely open up the CO2 tank, regulator, and needle valve, letting the CO2 into the tank?

Thanks for answering my questions.