Do not let your husband get primary or physical custody. Most men want that so that their child support is alot lower. And if you go and have a consultation with alot of the "good" lawyers in town, it is harder for your husband to find one because they already talked to you...
Normally I am all about being fair in a divorce, but after seeing a dear friend of mine go through a really nasty break up...I am just so made at how low some men can get without any regard to the welfare of their children. They just want to "hurt" their estranged wife.