how to make ellg like facebook or myspace.

I am  very new to elgg, and I noticed other great site that are powered by elgg. the big problem i have is that i dont know how to edit the main page of my elgg to make it look like these two sites listed below.  I want to be able to add ads to my site, like myspace have in their main page. or like rucku.com have on their site.  http://www.rucku.com/          http://eduspaces.net/ 

I love the themes that elgg provide, but I feel a little stuck when it come to trying to make some of the pages look like i wanted. can someone who has more experience and know more than i do, please help me.