Find Info for inherited website

I recently inherited the responsibilities for a www.remarpro.com site, and I am trying to find some more management information on it. This is my second wordpress project, and so I am rather new. After poking around, I verified the site should be www.remarpro.com because I have access to plugins (please correct me if this is wrong).

Where can I find out where the domain was bought from? I know that the previous owner had to pay for hosting, but can’t seem to find where. The site should be paid for for a while longer, but for management purposes the information would be nice.

Secondly, are there no limitations to ads if self-hosted (as my site should be)? Could someone guide me to instructions on setting ads up?

Thanks!