This looks like a great bike for a beginner like me, still learning about all the details, with this one is it tubeless ready or would it require new tyres?
For that height, a size M or L would likely be suitable- best to use our sizing calculator on the website to be sure. Also, the sizing chart is correct for these bikes.
Riser bars are typically not specced on cross-country bikes since cross-country bikes are specced for speed / racing conditions as opposed to comfort and leisure.
It is a brand situated in Koprivnice Czech. There are two brands there. Rock machine (bikes for fun, trail, enduro, freeride) and Superior, which is race oriented (but they also make great trail bikes too).
This sounds like a Medium, but it would be best to double check using our size calculator on the website! It will take into account a few different factors.