Download MT4/MT5 from a broker and open a demo account.
No. The best retail brokers will provide is tick-counts (tick-volume). If you want to observe order flow, the best you're going to get with MT is MT5 with a futures broker. There you'll be able to see the real futures DOM and orders. There are futures brokers that offer MT5 demos...google them.

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Is there a website where I can watch all order flows concerning forex without paying platforms? Or do there exist free piaffas that give this service?