Divorce law is both complex and variable according to which state you live in, so be sure to contact an attorney in your area who has plenty of experience. You should consult with several before you narrow your choice down; you can usually get free consultations with most lawyers.
Be very prepared before you go to a divorce law professional. Among other things, you'll need financial and tax records and a list of all your assets, especially if the divorce is being contested by either you or your spouse. Give them all the information they need to do their job, since by law it's confidential.