I'll list the things that you should consider prior to setting up a mining equipment:

1. Little to free electricity rate (as mentioned above)
2. Good mining location (you should have a place that could handle the noise and at the same time, doesn't have flammable surrounding)
3. Good air conditioning (you need good flow of cold air in order to reduce miners heat as much as possible)
4. Stable internet connection (the speed is not that important but it's consistency is important)
5. Depending on your budget, you will need to purchase the most efficient miner available in order to have the most profit overall
6. PSU or a power supply (as mentioned above)
7. Depending on how much your going to invest in a mining rigs, you should choose if you'll be mining solo or in a pool (if you have more than 200 TH/s of hash power, you could consider mining solo but anything less than that, you should only consider pool mining.