Let me get this straight.....you have plenty of experience trading equities( I assume you made money then?), but you want to be skilled in other markets now?
Go to any Wall St firm and see what all those traders trade, day in and day out. You have equity traders, bond traders, currrency traders, etc. Meaning they are SPECIALISTS in one area of the market and they stay focused in that area!
In laymens terms, you want to increase your skill level in the area that you are already familiar with.
So with that in mind, why dont you look at staying in equities and/or learn pairs trading? I know a few day traders who only do pairs and are very successful at it, and make excellent money.
I myself trade ES because I became specialized at it, now trade fulltime and still refining my craft to this day. Why would I want to cloud my brain with other principles of the market that would take me months if not yrs to learn and master?
In summary: Stay focused in the area that you are familiar with(in ur case..EQUITIES) and become better at it.
Good luck......