Icloud stored pics not coming to my computer

hello,

Once Icould control panel is opened on my computer, how can I send the files from my phone ? Because they are not coming by themselves.

When I click on "Manage", I do see a back up made made in end 2013. How can I access to it from my computer ?

And another question: In "photo stream options", when they say: "...and upload photos you add to your photo stream from this computer", the upload is only for photos which are inside the Icloud folder "photo stream", right ?

If there is a photo on desktop or in "my pictures", it won't be uploaded ? Because I share my pc with someone and I don't want other things end up on my Iphone.

Thank you for you help.