About your first question:
Did you decide in what style you are going to shape it? I think you need to figure that out before you start pruning.
I was thinking about Walter Pall his Picea Abies, although it is a different subspecies.
i19.servimg.com/u/f19/19/18/93/72/screen10.jpg
I do not want to copy it exactly, as that is less fun, but it is a guide for me on the path of this bonsai.
Mine also has a splitted trunk, a splitted sidebranch and another sidebranch. Oh, and the trunk is less wide.
I'll upload photographs tomorrowevening as it is dark now and I will be absent from home tomorrow almost all day.
I really like your input, all, thanks!