Hi,
when you edit your page, click on Customize in top left corner. After that click on Footer tab and find Copyright notice. You can use that field for your footer info.
For second questions, unfortunately, this would require a lot of customization and we do not support customizations.
For last question order of portfolio items can’t arranged manually. The last (the newest one) portfolio item that you made will shown as first portfolio item.
I hope this help you :)
Kind regards