I would personally suggest to start with EU and master it first. This pair, in my opinion, has way much more respect for the levels compared to UJ.
Have you noticed that 95% of trades Traderpusa takes are on EU? And he has been trading Larry for years! Unlike you and me. There must be a good reason behind it
I have been trading Larry live for half a year by now. 100% of my live trades are on EU. And it's more than enough for me! Both in terms of pips and concentration it takes and time I want to devote to my trading.
All of the above is only my personal suggestion. I admire many guys here who can monitor and succeed trading many pairs. But we are all different.
Let me answer that question with a simple page that explains why I prefer EURUSD
For levels to work, and also a pair to have a good reaction to news, it needs to be liquid. This liquidity is real volume opposed to the tick volume others use.
So once you move away from the main pairs and start trading cross pairs you see the liquidity drop dramatically.
When you are a novice, start with the most liquid which is also the most predictable pair, so EURUSD.
And once you are not a novice anymore, you tend to stay with a pair you know very well, so that is EURUSD again.
As you can see from my results, once pair is all you need to make money. And patience.
Once the Chinese government lifts all restrictions on the RMB I think the USDCNY will settle among the majors very fast,
just because the trading volume between USA and China.