Not sure what an electronic service is, but a wholesale center will require a great deal of cash or credit capital, as manufacturers will require you to purchase minimum amount of stock.

I looked into starting a lighting showroom, would need to have 10-15 different brands of lighting, and only one manufacturer required a min $50,000.00 initial purchase of stock.

Do the math.

This is in addition to having a building large enough to handle the stock you plan to carry, operating capital, etc.