I have my computerized Driving license of Lahore which is going to expire on 23rd of September. If anyone can tell me how to renew it and what documents I need, how much time and money it will cost me.
Just go to the Traffic Police office which is on the Mall between Government College and PostMaster General's office. Ask anyone there that you want to get your licenese renewed, they will point you to a kiosk. There you'll fill out a form or two, I think all you'll need in a copy of your ID card and your current driving license. I think the whole procedure should cost you less than Rs. 700 which mostly you pay in form of stamps that you put on the form.
Don't use agents, they are total rip off's.
Here's a sample form.