Hi, you may want to check these videos out, hopefully they will be helpful to you.

How to Build a 6 GPU Ethereum, Litecoin, LBRY and Other Cryptocurrency Mining Rig Part 1 : https://www.youtube.com/watch?v=uj6ylv68M38

How to Build a 6 GPU Ethereum, Litecoin, LBRY and Other Cryptocurrency Mining Rig Part 2 : https://www.youtube.com/watch?v=DiyjW_AAI9w

6 RX 480 8GB GDDR5 Overclock Graphics Cards All in One Computer! Cryptocurrency Mining Rig Part 3 : https://www.youtube.com/watch?v=FfpVVGkCoIk

Bitcoin Mining vs. GPU Mining & How to Assemble a Mining Rig for Ethereum, Dash, LBRY & More Part 4 / Part 1 : https://www.youtube.com/watch?v=C4UiFO_zW0w

GPU Mining With R9 390x 8GB OC & How to Assemble a Mining Rig for Ethereum, Dash, LBRY & More Part 2 : https://www.youtube.com/watch?v=YGINek7VnDE

GPU Mining With R9 390x 8GB OC & How to Assemble a Mining Rig for Ethereum, Dash, LBRY & More Part 3 : https://www.youtube.com/watch?v=y83ET5Ws51o

GPU Mining With R9 390x 8GB OC & How to Assemble a Mining Rig for Ethereum, Dash, LBRY & More Part 4 : https://www.youtube.com/watch?v=9GH6zkD9UjI

GOOD LUCK!