I have never build medieval house and I have never mod or made one...?

So I need help

First I would like to know what I need...I have MTW game
and thats all you should odottaa...takes English -Finnish book aaarrrgghh expect.

Secondly here is what I want to do...and I dont know is it possible:

Make land connection between Sweden and Finland
Erase provinces
Make new factions
make income and resources changes in provinces
alter units
( and tech tree as an result)


So teach me....