Some Questions About Microsoft Security Essentials

Hi all,

For a while, I had been running Avira Anti-Virus (free) and SpyBot Search and Destroy (free) but I decided I wasn't to happy with S&D. I then heard that Microsoft's new MSE was good, up-to-date, light, easy to use, and good at doing what it was supposed to do; protect my computer.

Now I have some questions:

First, does MSE cover all common kinds of anti-malware? Which ones do it cover (spyware, anti-virus, ad-ware etc.)

Secondly, it wanted me to uninstall all other anti-malware programs. I uninstalled Avira, S&D, and Windows Defender. The question I have is whether or not MSE acts as its own firewall, and whether I should disable Windows Firewall

Thirdly, keeping in mind that I'm only open to new programs, am I set with MSE? Are there any extra programs I should be adding to get full coverage against malware? I had heard good things about it but I want to be sure.