If you use the search function in the forum, you'll find a lot of threads made by people with the very same question as you : ) It's a helpful tool when you're curious about something regarding the website.

Here is where you can find out the details about personal stores:

link

That page has a lot of information and links to help you out whether you want to start a personal store, want to know how it works, tutorials, etc, etc.

Hope that helps! Good luck!