Reply to Wanting to begin Music Production, how/what to get to start?

Hi so I want to start trying to make my own songs

I already have Ableton Live, but I don't really know how to use it. I am believeing to purchase a midi controller
This one in particular, http://www.axemusic.com/product.asp?...=any&PT_ID=all

and try to figure Ableton out over the summer.
Is the MPK Mini a good keyboard to begin with? What are some tips/tricks to use with Ableton?
I am a total noob/beginner with this, and the only other music-type program I have is Traktor, which I use with my traktor S2.