Your going to need an EQ Direct Cable with a DB9 adapter for the EQ6. pegasusastro.com/products/eqdir-usb-stick-for-eqmod/
You can of course make your own.

Get KDE Neon running on a laptop and install KStars and Ekos. Get comfortable with how to use Ekos for polar alignment, plate solving and slewing your mount around. Then start adding devices as required. When your happy using a laptop, dive into the threads in the forum to learn how to set up a single headless RPi3/4.

Its a journey, you'll have fun for sure.

Keith

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