Another, lesser-known song by Fats Waller in the often raucous, sometimes deeply moving show “Ain’t Misbehavin’,” now at Norfolk’s Wells Theatre, advises ladies to — speaking of men — “Find Out What They Like” (and how they like it), and “let ’em have it just that way.” The ladies singing that early 1930s song are talking about, well, sex, but they could just as well be referring to theatrical offerings. That’s what Norfolk State University’s still new Professional Series, in partnership with Virginia Stage Company, is doing, with great success, with its first musical: giving audiences what they want and (judging from the applause) in the way they like it.