If i was just entering the mining market, I would enter via Litecoin.
You need to study, and then study some more.
I have mined for a few months now but so much more to learn. (linux is my next step)
You need to keep overhead down if you are poor.
Get a used gaming computer for cheap of Craigslist.
~you have to work to get them to come down in price. These are proud people.
Get a nice 7950 or 3 with warranties if can afford it.
Read up on installation and such, and then Mine some Litecoin
It may take a couple days to get everything working - but fret not - you can do it - these forums will teach you or direct you where to go for Litecoin or Bitcoin.
The biggest thing that led to decent success in Litecoin was the correct thread concurrency.
AND
If you want to get into Bitcoin - I would look into Asics and study the crap out of them too.
I ordered a Terrahash machine - I hope it pays off.
I currently have 2.3 megahashes on Litecoin (gpu) and 1 gig on Bitcoin (Asicminer usb and gpu)
Look with your future eyes - If people thought only of the today's Return on Investment 2 years ago mining bitcoin, they would have never done it. These are today's Bitcoin Millionaires.