Once you buy a domain name, it is yours. You can do anything you want - take things off, put things on... etc. I suggest going with a reputable web hosting service: fatcow.com, webhostingpad.com, hostgator.com, networksolutions.com, ipage.com are all very good ones. If you need cheaper, try name cheap - it is a fairly good service, and also quite inexpensive. Make sure you are buying "Web Hosting" not just the domain name.
or (if you are desperate) you could embed a Microsoft Powerpoint - it will only work in internet explorer. You could also embed a google docs presentation.
What features do you want? Do you need fancy transitions, or just simple slide changes? Should it automatically change slides after x seconds, or should it be a "click next to continue" thing (You could make separate webpages for each slide and link to them (again, not recommended - load time is bad and it would not look as good)
Let me know...