I think that the best way to get on with people is to be sociable and friendly. For that you have to help people and to be nice to them. You have to go to public places
(Malls, pubs, clubs...) and have initative to talk with different people and not be shy.
If someone comes towards you, you can not be rude to him, because if you do it, people will never talk to you again, because they will think you are snobbish.
So if you want to get on with people, you must respect them, if you want them to do the same with you.