New to elgg

Hello, I am very new to all of this.  I have a little bit of HTML understanding and that is about it.  I have no development, coding, creating plugins or any other experince that can hlp me with this col stuff you guys have created.   However, I do have some questions that may be basic.  

Can anyone tell me how to change the front page so that I can make my version of this:   
http://mylifethinking.com/social/pg/groups/1385/take-a-tour/  .  I am really lookig for the Dummy version.  It would be great if some one can point me in he right direction.  I have been reading and looking around, bt I am getting moreconfused. 

Thanks.  You guys are great!!!