My advice is to spend a couple of weeks here reading threads.  All the questions you are asking already have answers, and the experience you gain from mining is not easily transferred so easily in a single message to someone who doesn't appear to have mined before.

Good miners are able to read the "tea leaves"... seeing what other people are doing, experiment, and make your own plans.  There is no magic formula, and while I applaud your ability to sink $30K into mining rigs, you are taking on a responsibility that you may not be ready for.

I suggest you start with one rig.  Build it, tweak it, learn how it works, find the pain points, and then decide if you want to spend the rest.


What are your goals?  What are your expectations for capital expense recovery? (some people call it ROI erroneously)  What kind of expectations do your investors have?  Where are you going to be setting up the rigs?  Do they have appropriate power and ventilation?  Do you have proper internet, networking and other infrastructure available?  Do you have any plans for expansion?

Difficulty increases will decrease your earnings over time, and investing so much in RX 580s may not be the best use of capital.  They are good for Ethhash and Cryptonight algorithm based coins, but are already a generation behind the latest AMD cards.  There are hundreds of coins available to mine, some GPUs do better than others.  I would suggest you diversify the GPU types you use so you can react quickly to the changing scenarios that are out there.