@shineonmotors start with baby steps please roam around check the local workshop scene. Observe how they operate ( don't be shocked of their con skills ).
I recommend to visit and meet the chief at Obama racing systems in garden town lahore 0321 4106898, am sure you will not be disappointed to be his friend. He is from another plant like you. You just landed here he landed few years earlier and blended into system without compromising over his technical skills and modest personality. He is not a person who skin customers because they have money and peanut in the head, he does not accept jobs from such people no matter how lurcative it seems
- buying parts from anywhere over the globe is not an issue, the HARDCORE PORN is about the Pakistan customs, the valuation and the assessment for payment of duty & taxes.
you need to be very specific for declaration over invoice for example 
Generic fiber glass cold air intake - customs will "consider " it as industrial part and valuate it under HVAC item which is subject to 55% duty & 17% sales tax ad value -
if the same item is mentioned as:
Air Intake assembly for Honda Car - it will be assessed at 30% due to part of an automobile.
be very careful when getting parts from abroad 'Legally '
else there are groups who handle bulk cargo door to door service and charge by weight .
