Hosting From Scratch & Already Having a WP Account

Hi! I am moving the hosting of my website over from Average Advocate, but I wanted to start a new site from scratch here. I have a few websites at other servers that aren't wp.org but this is the first time I've build a second wp website. However, I can't seem to figure out how to do this, as you ask for the login to my wp to be able to switch hosting. But as that is linked up to Average Advocate, I can't give you that to connect the new domain to your hosting and install wp on your server for the new domain.

However, when I go to info on how to start a new wp website, they say to install it on the host BEFORE you make a new account. Point being, maybe this is obvious. Or maybe I just do it under my other wp account too, and then they seperate. But so far, I am confused on how to set up the new domain and install wp and host it on WPMU.

Thank for your help!

-elisa