Scanner or NinjaTrader?

You basically got it. If trading actual futures contracts or forex, most people trade directly within the NT platform, as it’s just more efficient that way since those are the charts we’re looking at. But you could very well place trades using whatever broker/platform you want. (However, Ninja is recommended not only for the ease of trading within the charts you’re already watching, but also the fees tend to be lower.)
If you’re trading Nadex, you’ll want to use the scanner.
In my opinion, trading futures/forex within the NT platform is more straightforward and a bit easier to handle than having to go between the NT charts and a web browser to place Nadex trades. You can see the advantages of both methods here. More here.
As for screen real estate, it is highly recommended to have at least 2 monitors. People sometimes say “I’m not advanced enough for that,” but in reality it’s not advanced, it just makes your life much easier. If you haven’t tried a multi-monitor setup before, spend a normal day working with it (not even trading, just in your normal computer use) and not only will you never want to go back, you’ll wonder how you got anything done before, using only one.

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