I think that the Dear Son and the Dear Daugher books are very good and I think both parties should read both books.
In terms of hilchos nidah and tznius, the chosson and kallah should agree on rov to whom they will ask shailos in advance and just agree to follow his psak.
All chosson and kallah teachers (especially kallah teachers) should tell their students that there are many different shittos and approaches in these matters and that they should not get upset because of they are hearing something from their spouse that sounds different than what they were taught.