Hello!
Long time lurker here and an ex CPU/GPU era miner, I've finally decided to take a more active approach.
Traditionally, in order to calculate the economics of your mining business, you'd cross-reference the hashrates of your mining hardware (from a database such as
https://en.bitcoin.it/wiki/Mining_hardware_comparison) with a mining efficiency calculator such as
http://www.bitcoinx.com/profit/).
You can play around with both systems, to see if what is available to you can be profitable at all, you could be surprised.