How do I transfer my photos from my cloud to my Mac? I don't want my photos from my Mac going into my cloud. I only want to put my photos from my cloud onto my iMac....how do I do this?

I tried a few things and the end result was  7,000 pictures that were in my photos app on the computer starting to fill up my cloud.
You'll have to download them from iCloud using the web interface and then load them onto your Mac. There's no option in iCloud Photo Library to go one way only.