Uploading files is very easy and the program you have is exellent for this job. I've been using WS_FTP a long time for many purposes.
Basically, the most important info you will need is your Host Name (address where all your files will go), your username and password.
click here for those details.
Enter these details into WS_FTP and you should be able to connect to your webspace.
WS_FTP window has 2 main panes. The Left side being your hardd rive and the right side is your webspace. On the left pane, navigate to the files you want to upload. Select those files and you can transfer them to your webspace via the small green arrows between the 2 panes. You can also download files from your webspace.
click here for a brief guide on how to upload using WS_FTP.