My main skills are on bar 2. I use this set up because I use the key board numbers to utilize my skills. For example, If I need UT pot its readily available when I press 0. I think the most important ones are dispel ( 1) UR and R ( 2,3)..... Heck all of them are important >_> but i don't want to write chapters lol.
Bar 1 is when someone is running. My favorite is Arrow Ice and Surge Shock. Also, its always fun when you can pig someone.
Bar 3 is for EB and detect mainly, the pots are extra. The main pots that are Dispel( I go thru 100's most important ) and Abolition ( Important) .... Well I change Abolition for Cure ( least important but essential) depending on who is pvping. If i need all 3 I just open my inventory.
Finally, my Buff bar I have Body protector, Prayer, and Magic protector ( even thou it has a cool time ). I have a second buff bar with Body protector, Prayer , Magic protector and FB.
Well this is what works for me hope any of it its helpful. >_>