use any mining calculator to calculate your earnings:
there is one : http://www.coinwarz.com/calculators/zcash-mining-calculator

as for the hardware ...
there is my another build with price and some basic hardware info i posted in another topic  its 250 $ over of your 2000$ budget with 7 gpu , but with 6 gpu you will be in that 2000$ budget

i can post a link to those hardwares if you want me to do

i would not suggest to build a 7 card setup , its not that easy to make a 7 gpu setup stable .


there is a straight link to the post :https://bitcointalk.org/index.php?topic=1668461.msg16916762#msg16916762

its not that simple as you think ...
best mining rig go and buy a full farm with 100 rx480 gpu or maybe 1000 .. that would be a best mining rig

it really depends on a lot of things :
- how much are you paying for electricity ? $/kw ??
- how much money you want to spend on your rig ?
- what software you going to use ? linux ? windows ? ethos ?
- there is a fees , you have to pay for the pool u using 1-3%, for the miner software 2-2.5%  for the exchange u are going to use , for the electricity u using ...ect

Answer for your question :  "and what is the daily or monthly revenu" its not exist its changing day by day , hours by hours .
use any mining calculators to find out your estimated earnings ,
http://www.coinwarz.com/calculators/zcash-mining-calculator
Dont forget , that estimated earnings is just for that moment !
if the price going down you will earn much less , if going upyou will make better.
its also really depends on the network difficulty


THERE IS NO SIMPLE ANSWER TO YOUR SIMPLE QUESTIONS

This is a "Generous guy opinions"


1
any cpu

2
any motherboard , it really depends on how many VGa card you want to mine with

3
any hdd or ssd min 60GB

4
min of 4GB of ram 8GB better any brand , any type what is working with ur mobo

5
if you are asking question like this ones , probably better for you to get a completed ,full build
something like this : https://bitcointalk.org/index.php?topic=1679407.0
or just use ebay and search for eth mining rig..

6
psu it depends what kind of setup you want , how many gpu , using the cpu for mining or not ...ect

7
cooling... keep your gpu temp under 85 celsius ,it depends how fair you placing your cards from each other , it can be fine with 30-35 celsius amb temp , but if your cards can not "breath" you can fry them ..

there is one of my build : https://bitcointalk.org/index.php?topic=1614386.0

there is another build thread : https://bitcointalk.org/index.php?topic=1584973.0

and there is a lot more on this site

The google machine or even reading other threads here will answer your question. Do a little research on your own before asking everyone to do it for you.

Form completed  thank you

Bittrex chart is a lot better than the chart of a huge one like kraken. Not sure why they have something that never really look like its understandable unlike having a candle sticks. Some exchange really look really raw when you see their charts, c-cex for instance seem nothing but black and white candles.
learning to read the indicators is really a good help, i always wanted to learn macd.