Returning to Runescape before NXT, a few questions!

I've had membership a for awhile before, but I want to wait until NXT is out or its in open beta for everyone to grab membership again since the price went up. But until then i still want to play. What free to play skills should i work on leveling? Which are important, easiest or most efficient doing on F2P? Or which are worth my while doing while im F2P? Heres my character : http://services.runescape.com/m=hiscore/compare?user1=El+Chewbacca

Thanks for all responses !