Most likely what you are going to have to do to advertise is to self-host a wordpress.ORG installation on a third-party hosting service such as bluehost, dreamhost, etc. You will have to install and configure the worpdress.ORG software there and then transfer all of your content over to the new installation. Figure an average monthly cost, all things considered, of about $10 to $25. Few bloggers I know that advertise cover their yearly expenses.
With self-hosting comes additional responsibilities. You will have to do all installations, all upgrades, all backups and all troubleshooting. If something goes wrong, such as installing a plugin or theme that kills your site, you have to figure it out and fix it.
WordPress has made self-hosting a site much easier than it used to be, but there are still times when you need a pretty high level of "geek" when things go wrong. Either that or you have to hire someone to fix the problem for you.