my 1st Astra J Audio Help CD400

[NEATH-LAD]

Hi friends,
I got myself A Astra J 64 plate, love my car
the CD unit is cd400 but it a port for the aux but not USB and the pressing the phone it just mutes the system, my Q is am i able to get a usb and be able to connect this to my cd400 and my IPhone to work? can you friends point me in the right direction mybe provide me with some pics or video to set this up, 
or do i have to get a different cd system that has usb, i would like to get the bluetooth on this as its all in my Steering wheel bout i dont know where the mic is (or where it would be) or even upgrade the whole entertainment system complete with a satnav on it, i am looking for cheep options really but would love to add extra to it. my be froot fog lights too.... like i said a am all new to this so please be gentle lol..... i think i know how to add my sub to the car now as a guy called rusty had put up some pictures on how to do it, when the cables arrive i will give that a go, 

again all your friends help would be gr8 thank you )