As os2sam wrote, CPU and GPU mining have become "obsolete" in profitable bitcoin mining. Nowadays one needs fast ASIC mining device(s) to have a chance in finding a block, or to participate in pool mining.
Current state of the art miner seems to be the AntMiner S9 or T9 or something.
Check also ebay for used miners. If you can afford then get one with more than 1 TH/s hashing speed, better would be > 4 TH/s, or the above mentioned one with about 14 TH/s.
You have to pay the electricity these devices consume (for example my S3 consumes about 0.36 kW/h, and the electricity cost for running it a month is 30 * 24 * 0.36 * $0.12 = $31.10 )
Before investing I would suggest to consult an online calculator for cryptocoin mining to get an idea about the profitability or lack of it...
The more hashing power your device(s) have and the cheaper your electricity is, the better...
But beware: these bigger devices are very loud (caused by their hi-speed/hi-power fans to cool the ASICs)  :-)

As said, you should ask non-cgminer related questions in the other discussion threads here.