best software for a beginner?

you will have to be more specific... what do you trade? do you require charting? etc... Your question is like "what's the best car out there?"
 
Yes you can execute orders from the software and no it isent slow for day trading ( look at the 2nd screenshot here http://www.quotetracker.com/screens.shtml). QT only has a few brokers you can trade direct from the software with you can see the list here http://www.quotetracker.com/qsources.shtml the list of borkers you can use is under "Integrated Trading Supported Brokerages" TD Ameritrade is one of them, not only that TD Ameritrade is a QT Sponsoring Brokerage so you get the software with no ads for free.
 
NinjaTrader is free for charting and analytics connected to your TD AMERITRADE account. There is a software fee if you wish to use to to trade live.

More information - http://www.ninjatrader.com/webnew/index.htm
 
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