Brother, i think you need to visit workshops and discuss with them, get their estimated quotes for repair works on cars. Lahore in general is a bit expensive when it comes to labor (of course being a big city and plenty of fish in the pond for denter painters : ) ).. however, i think if you can build trust among market and buyers that this man (you in this case) doesn't lie about the condition of the cars and sells them with complete honesty and guarantee of documentation, i think you can create potential buyers traction over time.
Another thing is you can also make a youtube channel and document the whole process, how to hunt and refurbish cars .. it can also gain traction.
There's always a small first step that one has to take toward the direction to reach the goal point.