(First, you're dealing in TH/s (terahashes per second), not TB (terabytes). TH is a measure of computational power of your equipment, tb is a measure of storage. There's no storage to be concerned with in mining.)
You're looking at about 4 months to break even if BTC stays at the same BTC/USD rate. Mining is high risk, so don't put into it what you can't afford to lose if the market goes down. Don't go into debt over it...
I agree with stating here, new to mining myself I can confirm I am mining at 2 TH a day and averaging .2 btw a day. Of course this will go down over time as difficulty increases. It is fun but be wary of the risks. Best of luck whatever you decide.