Question- After I unlock Whm, will it automatically jump to my Conjurers lvl?

[GeekMatt]

Yes, WHM and CNJ share a level, you'll just have higher stats and some WHM-specific skills that are very important for a healer, while losing some less-vital cross class abilities. Ideally when you get a class to 30 you want to unlock it's job ASAP, or at the very least, before you run any group content