Websites, blogs and forums can be the best place to sell Webhsoting space You can also advertise on other blogs and can also sell thru forums such as presently you are marketing free of cost lol
Usual: share hosting - vps.
Nousual: mail - game slots.
Now as a member:
You have to focus in a potential zone, your country, city etc, there you ahve to talk with your friends that recomedn you for those services, and they are gonna recomend you again.
Also offer prices not cheap and not expensive you have to remember that now we have a lot of companies with the same services.
You kinda have to try very many different things because there wont really be one specific way to get customers. Just keep trying til you see what works for you.
Best way to get your hosting know many people and visit your site than do good Seo by posting good quality and unique content in Article , Press release and blogs you will get good result