Time is the very thing you do not have enough of where mining is concerned. I seem to recall difficulty increases over time. You should already have everything in place if you are serious about this. And you should be able to show us that you have everything in place. What size is the warehouse house you are looking at? How much will it cost? How many gpu's do you hope to buy? How much will they cost? Where will you get them? Are you really serious? These guys are: https://qz.com/1039809/amd-shares-are-soaring-ethereum-miners-are-renting-boeing-747s-to-ship-graphics-cards-to-mines/