Im noobing it up clueless on interiors.
Could a map be created using contructor? or just a "object" building or whatever im making to place in a slate clone as a map?
if that is the case, how do i put it into a map so i can began testing my works
Yes, you could have an all-interior map. In fact, slate is basically an interior map because the 'ground' is made up from a very large interior.
What you use, how you make it and so on are relative to what you want the map to be.
EDIT: Forgot to say. You can spawn interiors ingame using the world editor.
Go
window>world creator.
Then press
Interiors in the right hand menu (on the side of the screen).
Navigate through the folders till you find your interior file(s)