Once you get your hosting, a mail will be sent to you with your cPanel URL, user name and password.
If you have your blog already hosted else where, backup as mentioned in
http://ravidreams.com/forum/topic/how-to-backup-blog-posts-from-previous-hosting
Then, please go to your domain name's domain manager panel and change the nameservers to
ns1.ravidreams.com
ns2.ravidreams.com
Wait for this to take effect (may be around a day) and then go to
http://yoursitename.com/cpanel
To set up WordPress see http://ravidreams.com/forum/topic/how-to-install-wordpress