I am using Windows 7 32 bit, Magix Music Maker 2015, 8 GB Ram
So I am quite computer and technology literate, but my references in the MMM world may not be accurate in defining what I am looking for in this case. For example, Vita is like a plugin or VST with a bunch of various instrument banks built into it. I would like to find more of these, and understand how to properly add them into MMM 2015 so I can use them just as I do Vita, Revolta and other VST's / Plugins with a variety of instrument banks and sound to choose from.

1) What is the definitive different between a VST (Virtual Studio Technology (VST)) and a plug in Magix Music Maker?

2) What is the best site for decent quality free VST / plugins like this where I can download and install into MMM2015?

3) How do I get these into Magix Music Maker so I can see them in the list with Vita and others and be able to use them in the same manner as the built in VST / Plug Ins (Instructional Guide elsewhere in forum?)?