Before you start, you need to know how much electricity fee in your city in a month so you can calculate how much money you should pay. Then you need to have a budget to buy the hardware for mining. You can buy the mining rigs which is available, and you can directly use it without a problem, and I am sure that it will cost much money. Then you need to determine the coin you want to mine because if you can get the right coin, then you can be able to earn nice rewards in a day. It will depend on the coin itself to get a big reward so you need to try one by one for the coin.