First of all, you have to put your web-page on a web-server that's publicly accessible ; you can find a lot of hosting services on the web (if you only have a couple of simple pages, you won't need something that costs a lot).
Once the server is set up, you'll have to use something like an FTP Client (FileZilla is an example).
Then, you'll need the search engines to "know" your page -- best way is to have some other web-sites link to yours ; this way, crawlers will sooner or later discover your page.