There aren’t any rules for the wives. Just, the guy has to be a good learner to get in because there is a very hard oral acceptance test on gemara. and good learners usually marry people from their own sphere ex, have no connection to secular culture (do not have TVs and dress very modestly) however there are many exceptions.
I know people in Lakewood that have 9-5 jobs, or are in college and at the same time learn at yeshiva for night seder. There are also night seder programs for those types of people.