Have you tried calculating your possible mining cost and profits with a tool like whattomine? It would help you calculate the exact numbers to help you decide how much you need to prepare to start a mining business. I do think that you need to think twice if you can't access cheap electricity.
Take note using tools like whattomine to calculate your profit is not accurate its just an estimation based on the current mining difficulty the real-time profit might be lower or higher because it still depends on the unit's performance and where you mine.
@OP if you haven't decided yet which unit you want to buy that can give you the best profit there is a tool that will give you insight into what ASIC units are currently profitable with your electricity cost.
Check out this link
https://www.asicminervalue.com/