Ableton and midi instruments!

HI!



I have ableton for my macbook, and recently got an M-Audio Axiom 25 from my friend.



I was wondering how I link it up to my ableton? (Not connect the knobs and buttons to ableton, but to actually install a midi instrument in my ableton settings?)



Also, when using ableton “midi” (not audio), does it only work/preview with midi instruments?