The 1100 / 1150's do not have a choke ( fuel injection ). The lever you are moving is just a fast idle adjustment. Now that you have had it running, you ought to do a quick oil and filter change. Add just 3-1/2 quarts of your favorite oil. After that, I'd go for flushing out the brake system with new fluid. Lines can wait. Once you have the brake fluid swapped out, you can now ride it a little, so you can swap out the trans fluid and final drive oil ( same fluid for now ). This will also allow you to run the motor a little more, moving clean gas thru it. A fuel additive might not be a bad idea.......
2012 R 1200 GS RALLYE