Welcome to the community, just like you, im am relatively new here. To address the problem with your bike,
Difficulty with starting - Try to get the "feel", you will get used to it soon. It is normal that a new bike is hard to start, i faced the same problem as you previously, only after a month starting up became a breeze. Just remember to disable the switch, and tank is turned on.
Stalling with low revs - The idling should be around 1k and minimum 800. If its a cold start, then it is normal that it stalls while idling, don't be shy to use the choke for a cold start. Let the engine idle about 3-5 minutes if possible, in my case, i usually let it idle untill the smoke is lesser before i make a move. Another reminder, i am not sure about the shop you purchased the KR from, however, in my case, the shop did a very bad job, they just gave my bike to me without proper inspection. Just like you, i am a newbie too thus i did not notice them and thought it was "normal". First of all, the chains are too dry, also, make sure to send to a proper mechanic to get your timing properly tuned. It is also normal for new factory bikes to run on slightly leaner fuel.
Its not really adviseable to have 2t premix in your petrol tank, why do you think they provide you with a separate 2t tank? also, you can adjust the amount of 2t/petrol mixture from the 2t pump. so i don't really get the point of premixing 2t here since our bike can do that themselve.
Lastly, as a noob like you, i would like to share with you some really usefull reads. I find this pdf file extremely usefull, be it for seasoned or new riders. Reminds you alot of basics that will help save your life.