Looking for GS/Staff build
You could have a look at the guides in my signature. They work well with a GS/staff combo (some adjustments needed for the leveling guide rotation, sure).
Be aware that playing a mesmer might result in giving up your ranger as main though, as it can be so much more fun… ^^
Mesmer PvE Guide
The Leveling & Open World Compendium
The Leveling & Open World Compendium
I actually used your “Lazy Kai” build up to 25. Guess I’ll keep using it and just switch from Sword/Focus to Staff for my secondary.