Set up spend a day doing the usual. Set the sag. Go over the ergos and set them up how you like it. Some people prefer to take the cross bar off those Renthal Twinwalls cause they're super stiff. The rear brake needs some attention to get it in the right place from new but if its a second hand bike odds are it'll already been done. Mix some fuel and take her for a ride! and then come back and give us a report! I'm sure you'll identify a few more things after a day in the saddle but you'll be grinning from ear to ear.. What bike are you coming off?
It'll be a nice sea change. The ergos are very different to a ktm from what I've noticed. Some people like them, others not so much, and some just seem to be able to ride anything!