Hai buddy...about the basics..u can extract any Rom using 7zip and edit the system folder(add or remove apps),change bootanimation.zip,change notification tones etc.
Then re-compress it using 7zip using normal Meathod..and then flash it..
There is an app called apk swapper that can add or remove apps directly from the Rom(no need to extract,compress etc)just drag and drop apps..
hit the thanks if I helped you,don't just say it...
sent from my E dual C1604
Sony Xperia E dual C1604
MY OWN NoZ ROM
STOCK KERNEL WITH CWM.....
HIT THE THANKS IF I HELPED YOU...IT'S FREE ACTUALLY BUT MEANS A LOT TO ME