Anyone can create a community but it would be good to first check if a similar communities already exists that could be used instead. To see the communities that have been created click on Communities within the Google+ app and it will list the Hackney ones first
Think about who should be able to find and join the community, who should be able to see the content and members, and whether people need to request to be a member. It's really important to get this right from the start as it's not possible to change some settings further down the line. See here for guidance
Join the most useful Google+ community of all: https://plus.google.com/u/0/communities/104138337784256331095
And this one is quite good too: https://plus.google.com/u/0/communities/111335090618317296762
Get the most out of Google+ and all the G Suite apps with training guides, cheat sheets, tips, customer examples, and other resources on the G Suite Learning Centre.