Hello I'm super noob in arduino but I have to complete team assignment 
I need to connect an Arduino Mega 2560, 2 MP3 module, a 64x32 LED matrix, and 2 speaker, but I'm not sure about the appropriate specifications (voltage, etc.) and connectors to use.
sorry for I can't show real image, because professor said you can't purchase until knowing proper connectors, and power supply
is there anyone can help 
They should be given in the specifications of the parts you intend to buy.
eg, the Arduino:
Note that full Arduino documentation is available on the Arduino site:
You showed a 3rd-party link for the LED module:
Note that there is a Datasheet provided on that page - it has lots of information about connecting it up!
If want more documentation/support than the 3rd party provides, go to the actual manufacturer (Adafruit) for full documentation and support:
Again, lots of information about power supplies & connecting-up there.
If the other products you're looking at don't have specifications and/or sufficient documentation for you, then look elsewhere.
I recommend you follow a few tutorials on the Arduino and get a copy of the Arduino cookbook. Skim the cookbook then read parts pertinent to your project. Then build small parts at a time such as getting the display to work, then add parts such as the DF player etc. I would suggest you have several Arduinos to work with. From what you describe the UNO or Nano should do what you want. As you build these sections try not to use the same pin twice unless it is the I2C bus.
You state: "I can't show real image, because professor said you can't purchase until knowing proper connectors, and power supply", the prof is correct. I highly recommend you do an annotated schematic showing all of the connections. You can get many CAD (Computer Aided Design) software packages for free. I use KiCad.
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