If I correctly understand your question, you want to modify the Front Page, and have the separated “Blog” page for your Blog Posts,
In order to be able to modify your Homepage, your Homepage needs to be a Static.
Please follow the instructions from the following post to create the Static Front Page:
Once when you have a static Frontpage, you can edit it with the page builder (we recommend the Elementor Page builder) and add to it whatever you want.
To enable the slider on your static Front Page, edit your front page (Dashboard->Pages->your front page/edit)
then scroll down to the bottom of the page, and enable slider on the page in the “Agama options” meta box.
If you have any further questions, please feel free to contact me again.
Please visit the following link, if you need the help to set up your Agama Slider: