Given the fact that you obviously have no idea about laptop repair, I wouldn't give your business venture a good chance of success; however, in the interest of helping, I'd suggest starting small. The very nature of laptops is going to make it extremely difficult.
It might be more profitable to get your hands on several broken laptops and attempt to sell whatever parts you can salvage from them to start with. As your inventory of laptop parts grow, there might be an occasion where you can put together one good laptop from several bad, paint it up, and sell it for a reasonable profit, but your bread and butter will be in the parts you can garner.
Eventually, you might find a niche you can fill ...certified service in your area, retail outlet, etc ...kind of like a junk dealer might grow into a service garage then into a car dealership. The business model is sound because it's been done ...just depends on if you are a savvy enough business person to make it work.