What is HTML?
HTML stands for "Hyper Text Markup Language". HTML is the predominant markup language for web pages. It is easy to learn and will leave you very satisfied as a result. Many DSi Compatable websites are HTML written.
How do I make my HTML Files into a site?
You can easily find a web host (webs.com, co.nr, ect.) that can serve your web pages to the wide world known as the internet.
What is in an HTML file?
HTML is, really, a text file. You can find special lines of code inside one that specify where links, text, photos, ect. go on the page.
as far as site hosting, I'd recomend hostrator.com, they provide 10 gigs of both bandwith and storage space. the editor built into the site frequently changes, so to edit I'd just recomend uploading "updates" for your site with this host. it is a great site if you have lots of media that needs to be stored.