Sorry for the delay, I forgot you posted this. For your first question, I hate to say this but, I don’t entirely know how to do this. I do know you can download all the contents of your wiki and move them onto the forked one, but I don’t entirely know how as a more experienced person did that on my behalf.

For your second question, that’s not what I did, but if it’s what you have to do to leave Fandom, you might as well try it! Your wikis are likely small enough that Fandom won’t notice you trying to fork unless you go around advertising it, so just don’t make a big stink about it on the Fandom wiki and you should be in the clear.

Sorry again for the delay, and sorry I probably wasn’t much help.