Shorting ETH

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Hey /Biz/
Really want to short eth but this will be my first time ever doing this on poloniex margin trader so I have no experience or clue of what I am really doing and came here for some help.
I read that you're "borrowing" funds so is there a limit with how much I can borrow or does it depend with how much I transfer to my margin account? I currently have about 0.5BTC and can see Eth going from $15 to $5.
If this happens and I short now, what would my return be if I used up the 0.5BTC in my account to place the short at $15.
and when I place the short, do I do it for the price it is currently at?

any help would be awesome and yes I have read the poloniex margin trader information but came here to get more clarity out of it... maybe examples would help me out too.

cheers homies