Three Questions! (Noob)

Ok, so I am trying to build a very simple mp3 player.

and I am quite far now, though I have a couple of problems...

1. What does the "OCLK" (Over sampling Clock) for the Decoder do? and where on my DAC do I connect that pin?

2. What do I do with the

DIF1
DIF0
DEM0
RST

pins? Do I connect them to my MCU? if so, where exactly?

3. Do I need my MCLK (Master Clock)? if so, where on the MCU do I connect it?


I only ask after I read everything on the data sheets, so I am not lazy, but some things I have just not understood yet so hope you guys can help!

when answering please refer to the question number...


PS:

My MCU is found here:

https://www.electro-tech-online.com/custompdfs/2008/10/39564c-1.pdf


My Decoder is found here:

**broken link removed**

My DAC is found here:

**broken link removed**