Hello,
3, 4, 5) In this case, I would recommend you to replace the slider revolution element by our Slider https://youtu.be/_dVwgeruFJk or Single image, and disable the Slider Revolution plugin.
Every activated plugin slow down site a bit, so you can disable unrequired plugins.
If you want to use the Slider Revolution, settings of navigation (arrow and bullets) are here – http://prntscr.com/ognbvt https://prnt.sc/ognc2e
6) Slider size on the page – https://prnt.sc/ogne5n
But it is not 1 image, there are image + shape http://prntscr.com/ognffg + background color http://prntscr.com/ognfri
Feel free to ask if you have any other questions.
Regards