If your promotion as a manager, what are the most important points and fundamentals that will get you started ?

The order in which I do will be 

3,2 and1 . Before diving in I.would like to know what is expected , What would be my role , How it is related to others , Who would be my stakeholders . 

Next would be meeting with staff - Identify what they expect from me , Analyse the general climate , Know who are there , How I / They would affect their / my work.  and the last would be as mentioned in point1

All are necessary for success but I arrange these in this manner3,1,2.

All points given in the question are important.

I echo with the answer of Mr. Socrates

Firstly i arrange the option in a manner of3,2,1. Becoz it is important to understand the sitution, which kind of work i m going to handle, then i take a meeting with my staff members and discuss about each and everything and get their opinion to how to make work better, being a manager i guide them step on step, make them feel good while working, always tell them about the team work, 

First I would identify what is my responsibilies are and understand my teams expectation, Secondly I will listen to my team and establish a Excellent Working Atmosphere by providing them the expectations which is genuine, Thirdly will make the team responsible make them feel important so that they will enjoy the work and will start believe in me.

to study everything about my new job then take a possitive descisson

3,,2,1 and take off.