editing scenes

[Moshbeast]

I am looking for a tutorial on editing scenes like this one: http://exilian.wikia.com/wiki/Scene_Editing_(M%26B)#General_Scene_Editor.27s_Advice but with pictures

 

[Moshbeast]

ok does anyone know how i can make a castle or town? by that i mean i want to make a castle on an emtpy location...