If you did not buy a web hosting account then you need to buy one. Since you are new to this thing, I recommend you to buy a hosting package at http://neond.com

They provide free video tutorials on how to set up and manage your web site. You can set up your web site using site studio provided by NeonD with few clicks.

If you have already bought web hosting account with godaddy.com then you should contact the support team for help.
References :

Need to edit a page for this you can use any ftp cliet if you are used to it. other wise first do it at our home computer/workstation than upload it.

If the page is been already uploaded you need to edit the page at your local system or download the actual file from your hosting server and than edit it and again upload it.

for cheap web hosting packages check
http://www.indianetcraft.com
References :

Hosting Info:

Free dns services to the internet community: http://www.everydns.com/
Web Hosting Jury: http://www.webhostingjury.com/
http://www.hosting-shopper.com/
http://www.rankpulse.com/www.siteground.com
http://b2evolution.net/web-hosting/top-quality-best-webhosting.php

Useful Tools/Info:

How to Register Your Own Domain Name: http://www.thesitewizard.com/archive/registerdomain.shtml
Web Design Tips: http://www.webweaver.nu/html-tips/
http://hapedit.free.fr/tools.php
Webmaster Frequently Asked Questions: http://www.thesitewizard.com/faqs/
References :
Use FTP to upload your site’s pages:

FileZilla FTP Tutorial - How to Upload Your Site with FileZilla

In this tutorial you learn how to upload your website using FileZilla, the popular free FTP application. FileZilla is available for Windows, Mac and Linux.

Read the full article here:

http://www.elated.com/articles/filezilla-tutorial/

Homepage of FileZilla: http://filezilla-project.org/

Ron

besides a domain, you also need to buy web hosting service from godaddy.com or other hosting company.

You can edit pages even in dreamweaver, notepad (requires knowledge of HTML)
References :
me and I and myself