Hi @DeeDesign,
Thank you for the clarification, to do that first you need to create a dedicated “coming soon” page. Then set the page template of that page to Blank - No Container | No Header, No Footer
Now add your Slider to that page using the Classic Revolution Slider element.
Make sure you remove the spacing on the section to avoid any unnecessary spacing to your page. You can do that by right-clicking the Section and Click Remove Spacing option.
Now the slider should occupy the entire page.
You then need to set this page to be your Homepage under Settings > Reading, just re-set this to your actual homepage when you are done developing the actual pages.
Hope it helps,
Cheers!