I believe you upload it to the /var/www directory. You should check the apache documentation and the httpd.conf (?) file. If you want to use personal web pages (like
www.domain.com/~username), you have to enable it in the config files and then you upload to /home/username/public_html directory.
As for checking your website, you should just try to connect to it with a web browser (actually with multiple web browsers). If you don't alter the path in the config file, there should be a "Welcome to Apache" type web page the first time you connect to it. It may even tell you where to change the setting and where to upload.