Start looking at the parenting classes that are offered in Hamilton County and determine which one will fit in easiest with your schedule. Start stockpiling away some money as well, because divorce costs money. There are filing fees and attorney's fees, as well as fees for mediation. If any part of your divorce is contested, both Hamilton County Circuit and Chancery Courts require you to go to mediation---most mediators charge anywhere from $150 to $200 an hour, often with a two (2) hour minimum. It would be best for your case if you can reach an agreement with your spouse regarding the various issues in your divorce, which will include property division, splitting assets and debts, custody, and child support.
If you know you will be filing for divorce, you should start thinking about these issues ahead of time and make a list of your negotiables and non-negotiables. Be realistic. It is very unlikely that you will get everything you want. If you can compromise on a few things, you may end up with a much better resolution than a judge will give you.