If you have not bought these already then you may want to do a little research.
Look at the cost of everything. You probably will not see a Return On Investment (ROI) at todays difficulty it would take 271 days of uninterrupted hashing to make your first dollar in profit after all costs and that is at the price of Bitcoin today.

but since the Difficulty changes every few days.. and the cost of electricity is also unstable and the price of bitcoin is not really stable either.. you may never really see any profit.

don't get me wrong it is still possible that things may improve in the price of bitcoin and you could make a profit.. but at least consider all options.