it sounds to me like youve already made a great start, especially if he's already dipping a toe in the shallow end. you may be chomping at the bit for more but i think patience and time are your best options, personally, weaning him in gently. after all, hopefully if he's enjoying the first steps then once he gets used to it he may be open for more in time.

it seems much better, in my opinion, to be patient and wait for him to catch up with your tastes rather than rush it and risk putting him off... or, worse, messing up the relationship in general. better to have half a loaf with the possibility of more later, you know? *smile*