When it comes to information about Florence online, there is a lot available, but comes from a wide variety of sources.  

A good place to begin some preliminary research is from a number of local websites such as Florence Pages, this site will provide you with all the current news and events from around the city.  It also contains a huge amount of city related information as well as local resources. 

There are many foreign embassies located in Florence, and if a particular nation doesn't have a embassy in Florence there will be one somewhere within Italy.  For a complete list including contact information and locations, visit Foreign Embassies in Italy .