See https://docs.sonarqube.org/display/SONAR/Documentation for current functionality
Your first view of the SonarQube platform will be a Global Dashboard, which aggregates information from the instance as a whole.
From there, you may want to head to the Project Space of your current project, where you'll see all the primary indicators of quality gathered together. First, and most important, is the Quality Gate status. Does the project pass or not? From there, you can decide what needs to be worked on.
Or you could head to the User Account space, to see your personal leak, i.e. the Issues you've introduced recently. Some of them can be hard to find ahead of time, but many can be headed off by doing a Local and Branch Analysis.