First impressions count. Introduce yourself and others to each other. Be thoughtful to others and communicate. In fact, communication is the key to happiness, especially when thinking in terms of community.
Try and get people together by being positive about all around you. Organise an open get together - barbeque, street party, picnic.
Create a hub for the community - place where people can get together - like a community hall - where you can share and make plans to making your environment a better place. Remember, there is always room for improvement!
You can only be the best you can be, so set a positive example by being your best - considerate, mindful of other people's perception of reality and unconditional in your giving.