Yes, I’m afraid you should create your studies afresh in Builder, but it’s generally pretty easy to do. Code snippets will be needed when you do things that are a bit out-of-the-ordinary but on the whole you’ll get most stuff up and running in no time just with the graphical components. Feel free to compoile the study to a script for a quick look but resist the urge to start running from there.
With minimal Python code to convert, relatively simple code (without python libs) will auto-translate for you (in version 2020.1) and you should be running online in no time