Yes, going for single currency pair seems to be a good idea for learning fundamentals as one can concentrate on all aspects and factors and news releases affecting the currency pair. If you are a beginner, it is always better as it is easy to trace its movement, instead of messing you up with many. Plus, you can analyze that pair for different time frames like 5 min, 15 min, 1 hour, 1 day and so. Both fundamental and technical analysis of one pair will give you hold over it and afterwards, you can add more pairs to your platter.