To create a new Team, go to http://www.start.me/organization/new and specify a title. Just press ‘Create’ and a new team will be created for you.
The first 30-days are free, so you can try it out. After the free trial, the cost is $30USD per month. More info here: http://support.start.me/hc/en-us/articles/201139992-Introduction-start-me-for-Teams