In the beginning try with some of the major pairs like EURUSD, GBPUSD or USDCAD as usually they have the tightest spreads but you should be careful when there are economical news which might affect them. You should focus on no more than two pairs at first until you have enough experience to easily detect the patterns. In this thread a similar question is asked, you might find it helpful: What Pairs did you start with and why?
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