In fact, this problem is not complicated. The complicated reason is that you are a newcomer, you don't know the leader, the leader doesn't know you, and you are not familiar with the people around the leader. This makes you more timid.
So first of all, you should increase your self-confidence, cheer up and feel at ease to see the leader.
Specific practices are as follows:
First, simply sort out your self-introduction and things to do, so as to make your language concise, speak appropriately and give people a clear and good impression.
Second, call the leader you don't know: "Are you XX? I am the new MM in XX department, and I have a copy of XXX information (documents and receipts) that XX has signed, and now I need your approval. Is it convenient for you to go now? "
Third, you can ask your boss to call the leader you want to see and ask him to contact you and introduce you to him.
4. When the leader is away, you can wait outside the door clearly. When waiting, you can consult your colleagues around the leader about signing the contract, and take the opportunity to contact your feelings-acquaintances make things easy.