WP-Subdomains

Hello. I am trying to designate all of my blog categories into subdomains. For instance, relationship posts as one subdomain and recipes as another. Also I want to display relevant ads to each category. I came across the WP-Subdomains plugin.

Has anyone has experience with using it and if so, can you explain to me how it works?

Do I need to create the subdomains or does the plugin do it for me?

Or, is there another way I can do this besides using the plugin? I’m self-hosted and I want to set it up as category.domain.com.

Here’s my blog URL: http://www.LexiB.net

Thank you in advance for your assistance.