Big Sur, step by step - some questions

Hello,
I'm looking to upgrade a not currently working Yosemite installation.

I'm a bit confused by the steps though.
I can't follow the update directly steps as I don't have a working machine.

Here's where I am at.

I've downloaded Big Sur and made an installation disk on USB.
No bootloader as yet (well I have an old one for Yosimite but that's not going to work for this).

Step 1 - Get a bootloader - should...

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Author: AIDAN108108