Hi
The best place is to start searching their documentation. They have lots of useful articles there.

Avada provide demo code so you can just paste it in and get the homepage looking like the demo then change to your own text and pics. Yes you are going to have to read the documentation for this one. Most things you want to change, no need to mess with the code, just check in the theme customization options and there it is, a place to change whatever you want easily. If you can find where. Many many options, great theme. Deciding which slider to use is pretty hard though.