Hello - welcome welcome!
You say you're not a tech guy so I would advise against starting a mining farm especially at least wait until the new AMD + Nvida GPU are released as this will drop prices of other units.
A mining farm is difficult to start and manage for a experienced tech and if you're mining for profit you will also need some shrewd business/trading skills
You should add some GPU's to whatever hardware you already have or even start by CPU mining to get a feel for things like mining software, mining pools, writing batch files, crypto exchanges.
But in answer to your question
Motherboard -> H81 BTC Pro2 R2
http://www.asrock.com/mb/Intel/H81%20Pro%20BTC%20R2.0/ Risers -> USB risers (no sata for powering them & no ribbon risers)
Power (do not buy cheap) -> Evga Supernova G2 or P2, SuperFlower Leadex, Corsiar AX or RM
GPU (most power) -> R9390(340sol/s) - R9 Fury(400sol/s) - 7990(500sol/s) - ProDuo(810sol/s)
GPU (most efficient) -> RX470(230sol/s) - RX480(260sol/s)
CPU -> whatever is cheapest
RAM -> whatever is cheapest
There are also some problems to think about
A major issue also is cooling - running 1 or 2 5/6 card rigs in a room might be acceptable but a farm you would have 60+ cards so it becomes a real issue.
Another point to think about the power in your mining location. Running 10 rigs each at 1000W constantly puts serious strain on the wiring in a normal house and can eventually damage them.
The list goes on but you're in one of the best places to learn about mining your best bet is to read as much as you need to on here and gain the knowledge before embarking on such a large scale operation