Finding coding for Home page

I have a site in asp.NET Asp.NET was to complicated for me – so I reverted to the first WP site
I will implement some of the functions – slider and sections in orange from the asp.NET site. The coder making the website is no longer there, and I can not find how to access and edit Home page and footer. I remember coder said templates and css resides on server and has to be edited from there by FTP. I found the ‘Below Home slides’ section but that is not what I need.
I am familiar to FTP and can navigate in basic HTML, so I feel I am able to maintain the site when this basic issue has been solved. I would be very happy for some advise either to solve issues for using the Home page and go on with that, or starting from fresh making a new Home page in WP.
Feel a bit rusty, so I need some practice to get back in business 🙂