How to create my own rooted .540 mena Arabic rom

So i want to make my own rooted firmware .540 5.1.1 for my d6503

My phone is from middle East so an planning to use the original build
So it's mena Arabic

I did found a way to install it using flashtool but nothing about root

My phone is now rooted with locked bootlloader

If I flash using flashtool, can I root directly from 5.1.1 ?