Solution :
Once the domain is hosted the default file will be uploaded automatically. If the domain is loading with default plesk page then you have to rename the index file in the below format
which you want to set as the home page.
html >> index.html
php >> index.php
asp >> default.asp
asp.net>> default.aspx
Also you can upload the files using the below procedure
Please download ftp software like Filezilla.
http://filezilla-project.org/download.php
Install it.
[1] Click on File >> Site Manager
[2] Click on New Site option
Supply the following details
Host : ftp.yourdomain.com
port : 21
server type : FTP-File Transfer Protocol
Logon Type : Normal
User : your ftp user name
password : your ftp password
[3] Click on connect
[4] Now you should be able to view the local system in left side and server in the right side
[5] You can now start uploading the contents in your httpdocs directory.