I have personally started building my own mining rig, A mining rig is a self built computer system, that is built from scratch. Can be a normal desktop computer turned into a mining machine, with good hardware.
First of all what do you need to start mining? WELL you need to have a pc with very good speed like atleast 600 mhz minimum speed. This can be achieved with graphic cards, Good graphic cards recommended for mining is the first suggestion i can give for your hunt for a good graphic card.
I just bought a Msi R7870 hawk Graphic card with good properties as second on a Facebook buy and sell group, Best places to get a dedicated card for a reasonable price. PLEASE DO CHECK OUT WHATS NEEDED FOR MINING AND START MINING AND EARN MONEY.... CASH FROM MINING MORE THAN ONE CRYPTOCYRRENCIES.