Things you need to Create a website :-
1) Webhosting space :-
A place or a server where all your web pages and other site data is stored.
for free webhosting site:-
http://www.freehostingsites.net/php

2) Domain name :-
Domain name represents an Internet Protocol (IP) resource, such as a personal computer used to access the Internet, a server computer hosting a web site, or the web site itself or any other service communicated via the Internet.
Generally webhosting sites provide free domain names .

3)The most important thing -The webpages
For this purpose You will use wordpress ,In simple language it is group of programmed scripts to make website creating process easier.It is a free and open source blogging tool and content management system (CMS) powered by PHP and MySQL.There are many other open source blogging tools :-
Drupal
blogger
joomla

4)Filezilla client to upload wordpress files to your host.

Steps:-
1)First you need to create a webhosting account. Some free webhsot :-
bytehost.net
p40.net
for webhosting account creating help :-
https://www.facebook.com/237993949585497/posts/224373127631492

2)Go to http://wordpress.org/download/
and download the latest wordpress

3)Extract the zip file.After extracting ,Upload all the files off **wordpress 3.x.x ** to **httpdocs** folder of your webhosting server using filezilla .
Filezilla tutorial :-https://www.facebook.com/237993949585497/posts/320602444646749

4) After that Go to cpanel of your webhsoting account and create a mysql database.Then create a Mysql user.Note down the credentials .Also check for mysql host.
5) Go to your site : www.yoursite.yourhost.com
6) Fill the gieven fields accordingly.
7)You are done now.You will now be redirected to your main page.Click on dash board and add posts or do whatever you want to do with your site.