I will post this here too, because not all read comments in game page.
1) - Sry for lack of tutorial
2nd)
>Read your quests!
>Only fenced-off areas are counted as rooms (20+ blocks as i remember)
>Press E to interact
>Dig rooms with LMB
>Build walls with RMB (for those who have problems with rmb, there is option to rebind in game. I personally recommend Q)