How do I build the site after installation?

Hello, everyone. Well, I’ve never done this before, but as I understand it, to put up a wordpress website, I need to get a dot com, set up a hosting account with someone like BlueHost, install wordpress, and I’m good to go. My question is this: How do I actually work on the site once I get wordpress installed on the host server? How do I get the wordpress login screen that allows me to create pages, etc.? Do I have to open a browser window and enter the site URL to get the login screen? Do I have to “park” the site or something while I’m building it, or how does all this work? How do I work on the site once I have wordpress installed? Any help here will be greatly appreciated.