@Bobbingbuoy you ask what are typical insulin doses at the beginning. There is no such thing as “typical”. For example, an adult with Type 1 may start on very small doses as their beta cells slowly die off. At first, our pancreas may be producing a significant proportion of the needed insulin. Others may lose their beta cells quicker and need to inject higher doses sooner.
As
@Inka mentioned, it is common to slowly increase our dose rather than risk sudden BG drops.
It is also common to start on fixed doses to keep things simple as we learn to give ourselves insulin.
That said, with Type 1 (apologies I do not know if this would be the same with 3c), very high BG can result in Diabetic Ketoacidosis (DKA). With your numbers it may be worth testing for ketones as high levels of ketones can be dangerous, I recommend asking about this when you talk to your DSN.