Your mining rig spec is appropriate for mining ethereum.
Always check profitability comparing sites like whattomine.com.
Many shops are starting to support paying with cryptocurrency, but I think it will take a long time for it comes into our lives.
There are some youtube videos like 'Living only with bitcoin for 1 week', you could watch it.
Good luck.
Thanks bro but till that time i need to store those coins? Without utilising it? Always check profitability comparing sites like whattomine.com.
Many shops are starting to support paying with cryptocurrency, but I think it will take a long time for it comes into our lives.
There are some youtube videos like 'Living only with bitcoin for 1 week', you could watch it.
Good luck.
I am thinking to build ethereum, zcash & etc mining rig with 5 xfx rx 470 rs 4gb which may make profit of $200 with current price of ethereum ($297).
*And this maybe be a very noob question but I still didn't understand how this cryptocurrency works and what are it's applications? 
*For example if I have 3ETH after 6months but where can i use those 3ETH in real life? 