Thanks guys, I've registered on bittrex and so far it seems fairly understandable. Plus, a minimum order is 0.0005 which is quite all right. One has to send some btc from the wallet onto this exchanger to start, am I right? 'cause obviously I see that I have zero balance right now. I sort of understand how to get the money onto the website. But what is min withdraw from it? I can't see it anywhere.
You need not send BTC for starting at bittrex. You can send any altcoin that is supported at this exchanger.
There is no withdraw minimum. But it must be higher than the transactions fee.
To get money out of bittrex, just go to wallet balance and click on the "-" of that coin you want to withdraw.