Wages in Turkey can be a bit trickier to ballpark than some other destinations. This is, in part, due to the cultural expectation that you will negotiate a bit for your pay if you are hired directly by a school or center. It is also, in part, due to the major industry language chains like Berlitz, English Time, Wall Street English and other large companies that have a presence in the big cities making hourly pay adjustments routinely or paying workers differently based on experience, qualifications, or negotiation skills.
As a rough figure, at language centers the pay can range from $500-$1000 per month, whereas at universities the average is closer to $800-$1200 per month.
While teaching here might not bring enough salary to make you wealthy, it is easily enough to support a decent lifestyle within the country, even if you are just getting an entry level position in a commercial chain.