I am a b-berry newbie so please excuse my ignorance

I just got my 7100 from O2
how can i change my interface so that I am operating with icons ( in teh familiar windows feel)
I checked "theme" in my options but coudl not find any additional theme loaded

I assume I must download and install a theme but don't know how to do it

Thank you and I apoogize if this has been cited 1 million x