Bro, I would sincerely advise to first buy a used bike, preferably 70 cc, and do not spend may be more than 30-40,000 PKR on it. You may even look for Chinese bikes.
First learn how to drive bike, spend at least 3-4 months on it and learn bike driving, road sense, etc.
When you have sufficient expertise, then switch to any bike of your choice (preferably brand new one); any budget and any cc.