Avalon Master/slave multicomunication

Hi, I have cyclone V gx.

I try to using memory, and I don't uderstand how alavon works.

Memory module in qsys has slave avalon, how much master connections can be?

What is the best way of creating multiprocessing application with one memory?

And second: I downloaded "avalon master template". It has connectors to avalon, control signals and user signals. I try use it, but it works once. Does somebody work with it?