A
If you are a secretary, or personal assistant, getting a new manager means that your job will probably change, too. The new person is likely to have different ideas about how things should be done, and you may well find that some of these are changes for the better. But remember that the new manager might be feeling nervous. If you treat their first day in the job as though it's your own first day, too, it will ease the transition for them, and benefit you both.
B
Your new manager may have different ideas from your previous one about personal habits, such as eating at your desk, and you will have to accept that. Their changes may not always be appropriate or helpful, however. It could be that you are asked to open the post later on in the day, when you know that it is important to get it sorted first thing. In this case, rather than grumbling about it and spreading discontent around the office, explain if there is a genuine reason for a particular way of working.
C
If your new manager has joined the company from outside, they will be on a steep learning curve. Youcan really show your worth by bring them up to speed on the company history and culture. The appointment of a new manager is also the ideal opprtunity for you to discuss your prospects for training and promotion with them, though raising the subject on their first day is unlikely to give them a good impression of you.
D
If you are concerned about changes that your new manager wants to make to your job, first check your job description, if you have one, then speak to him or her calmly about it. If work is being put your way that is someone else's responsibility, say so. Make it clear what you believe to be the limits of your job. Ideally, the two of you will come to an agreement that suits both parties. failing that, consider contacting the human resources department to see if it can act as mediator.