Thank you so much for using our theme Corporate Plus Pro.
1. We have a different menu location for home page, so please use the separate menu location for it.
Please follow this blog to create menu for One page site. http://www.acmethemes.com/blog/2016/04/corporate-plus-pro-few-steps-to-create-one-page-site/
2. Please make the first child page to make it appearing for first service. There is no any options for it.
If you want to order the page on that widget, you have to do some custom work for it. If you are familiar with WordPress codes, please edit the widget AT Service Widget.
Note: Child theme is recommended to customize theme.