(Easy) Using Sitebuilder: Login into your cPanel then look for "Sitebuilder" use that program and make your site. (cpanel login details are included in your welcome email)
(Normal) Using Wordpress: Login into your cPanel then "quick install" look to the left and click "WordPress" then click "continue" the first line has your domain name then a space. In this space list the place you like to install (normal is wp) then completed the other details and click "install now!" After that check your email for how to login to your wordpress account.
(Harder) Make and design your site using a 3rd party program then FTP it into your account