How to keep large file but export reduced optimised

[enginestar]

Let's say I have a file that is 4000 x 4000.
I edit and want to keep a master file.

I now want to save a version that is 1000 x 1000 as  a JPG.
Is there a keyboard shortcut to do this?

Do I have to:

- save
- reduce size
- export as JPG
- close file and be careful not to save (which I've done many times in Photoshop).
(or i can undo - but still same problem)

Also... another question...
What automation tools are there... what can I automate? Just looking for a link to read more.

Also... how do I drag the window around. If no tool is selected, I can't drag around - I normally press the space bar and then move the mouse around. I can't find the same tool you have in other graphic editors. 

Thanks.