What do you mean by trading exchange for newbies? All exchanges are for everybody and no restrictions to a particular rank of bitcointalk. However, what you should have say is that newbies need experience on how to trade in exchange.
A simple exchanges report for their reference only, they can found info here without actually use all of them
The reason why I said that is because I trade on 3 different exchanges and I only log in to them whenever I only want to be making a withdrawal or deposit, while I use my API to trade on the likes of Tabtrader, which has always served effectively and I believe that is good enough. For reputable exchanges and at least to my own taste, I will say I still feel comfortable with binance and bittrex.