Hi , i am new general question..

[eluser]Unknown[/eluser]
Hi , i am new to CI .
i have question :

I build already my own CMS .

Now, it will be hard to bring my cms into codeigniter ?
I have my own login system and my own cms BUT i need some few functions that have on CI.

so i dont understand where i start either...
my cms build with includes folder ,admin folder ,and theme folder ,and all this run by index.php

infect I dont understand how CI working lol.

How i put there my own functions? ,
how i put there my own admin control panel to use with CI ? ,
i really confused and dont know where to start to move my current CMS to work inside CI.

i already read the documents but there only how to use the codes inside CI ..

i am not that PHP exp , i just programing 1 year.

Thanks for help...