Regarding 5, the colder it is, the quicker the snow will settle and become hard to shovel by hand. Not like when it thaws and refreezes, but if it is -25 C you'll want to move most of it while it is falling or shortly after. It is likely the snow particles are very small and it will become very dense if allowed to sit for a while.

Regarding 6, you can't shovel snow fast. It's a marathon, not a sprint. Don't use a regular shovel, there are sled-like contraptions that allow you to push the snow around on the ground and that will allow you to bring it further with less effort. Dress appropriately, you don't want to become too sweaty and you are going to figure out an equilibrium where your heat and sweat production stabilises your temperature, or you're going to have to take breaks and on average get less done per unit time.

Regarding 9, if you don't have an axe, get one. In harsh conditions tools are what keep you alive and things like axes and knives are part of the basic equipment you need to have and take good care of. You do not split the wood indoors, do not bring it indoors unless it is split in small enough parts that lighting it will be easy.

Also, you should really avoid using wood that hasn't had good shelter up until time of use. Moist wood will add a lot of soot to your chimney and you are likely not able to clear it yourself, meaning that you run the risk of a chimney fire.