I’m new to Ruby too.
You need to provide them, then maybe someone can help you.
Here’s how I patched and imported (the last, import step, must be done as the discourse user):
https://meta.discourse.org/t/importer-for-simple-machines-2-forums/17656/60?u=omfg
My import steps are described at the bottom of this page:
[Paid] Need a Vanilla 2 Import tool (just don’t try to import a .gz file, it must be decompressed).
If these steps work for you, that would be that. If not, I can’t help because I don’t know anything about this stuff. But you can post your steps and the error you get.