My advice to anyone purchasing the Korg Micro Arranger would be threefold, as could be your way of playing on it.
It goes without saying that your initial response will be to simply play the keyboard as it is, that is with its small keys and its factory presets. But that soon wears out. So my advice would be to hook it up to your major keyboard and solely use the keys of this major keyboard to play the Korg.
Once you have done that to such a degree that you know what's cooking you can move on to what I would dub a "definitive hook up" giving you maximum freedom without having to use the mini keys for accompaniment or most of your solo playing.

I have worked out a MIDI setting on the assumption that your major keyboard is a Yamaha one. I invite all those with a Yamaha and the new Korg Micro to give it a try. You can find my set ups on page 8 of my webpages:

http://pasounds.intropagina.nl/page-8-hooking-up-your-micro-to-major-arranger-keyboard.html

It goes without saying that folks who want to do this with a Roland or Ketron will have to check their manual as to Midi transmit.

regards,
John Smies

P.S. and of course getting my 2012Micro Resources might be a good start sound- and style-wise..