Short conversation between the King an the Queen-to-be

Would it be regarded as correct and acceptable by native speakers?

QUEEN TO BE: But I think I don't qualify to be a good queen.

KING: Don't worry about that. I'll take care of the government. You just (should) make your master happy. I'll be at the same time your husband and your most dedicated servant.

My main doubts are about the use of "qualify" and the inclusion of "should". I want to remark the contrast between him being her master (maybe "her lord") and being her servant at the same time. Furthermore, I want the dialogue to sound correct but very old fashioned.