Howdy. As this is posted on the Moesia area I assume you’re still trying to do this with the same template?
If you’re trying to remove the sidebar from the main landing screen/page, it can be done by editing the Page that you are using for this, and on the right side, find the Page Attributes tab and from the Template dropdown, select Full Width.
This would work for any Page that you want to remove the sidebar from too.
The documentation for the theme is here, and I remember it mentions this in amongst other useful tips: https://athemes.com/documentation/moesia
As for the footer, I believe if you don’t select any widgets all that there should be is “Proudly powered by WordPress | Theme: Moesia by aThemes” message shown? You would need to edit the code to remove this so not quite strait forward as using a template option, but for a free product and theme template I’d suggest leaving it as a thank you.
Hope this helps.