iPad died. How to retrieve iCloud data (and erase device) ?

My iPad died, so I'm selling "as is".
I don't have another iPad, so I need to access the data in iCloud on a PC.
I have used iCloud before from a browser, so I will try that.
But there is an app called NoteSuite that has HUNDREDS of my files.
I know they went out of business, and said they were going to provide some sort of data-export tool,
but I haven't been able to find it. Does it run on a PC?

iPad was fun, but wasn't a real work-tool in my opinion. PLUS I lost gobs of files
when another app had bugs. For these reasons, I am not going back

And if the buyer is able to repair the iPad, I will need to give him the 4-digit passcode, right?
But I want to erase the data before he can access it (lots of passwords for email, other
websites, etc...not to mention photos, personal journals, etc.)

Heee-llllll-ppp!

I see below that this doesn't really fit into any of the supplied categories.
Sorry for being such a newbie about this. I don't want to become an expert to fix this problem.