A budget would be helpful, But I would seriously look at this:
http://www.samsontech.com/products/productpage.cfm?prodID=2009
It's portable, meaning he could do his thing anywhere (comes with a wall wart, but can be operated with batteries). It can be used either stand-alone or as a usb control surface for operating his favorite software. He can drag-and-drop the wav file into the computer and mix them using the control surface or record them into the DAW as the are bening mixed.
It has 16 XLR/ 1/4" inputs so expanding to more instruments is no problem. It records to SD media cards, so media is available everywhere. And, to top it off: It's affordable---- $399!
As far as the microphone is concerned: You can find a lot of widely varied opinion on this forum. Check out the mic forum on this site. Here's one thread to help:
https://homerecording.com/bbs/showthread.php?t=53878
Lastly: Tell him to join this board. Tons of information to be gleaned just by reading and lot's of knowledgeable people here. Also have him sign up with the board at
futureproducers.com. The focus there is on hiphop and rap.
Good Luck