There is a proverb that a first impression is the most correct. So it's very important to make a good first impression.
First of all you should be friendly and kind to other people. Also you can give people some compliments and ask questions to sustain a conversation. You should listen to people and shouln't talk too much about yourself.
If you meet new people at friend's party you can joke and tell funny stories. But if it's your first workind day at a new job such behavior won't be appropriate.