different themes for the same web site

I'm thinking to design my web site with different themes.
I'd like to create the front page without left and right side bars.(with my own design).
In that front page, I'll put the button and when it is clicked, it will go to the default page which has left and right side bars.
Does anyone know how can i modify to create it?
Please share your ideas or suggestions of your experience.
Thanks in advance.