yes, get all the paperwork before you file.
yes you have to be separated for a time but that may happen with the two of you int he same house.
go interview some lawyers and hire one.
With etc., you need to contact an attorney who can review the facts of the case and then advise you. A good idea is to complete a financial statement or loan application listing all assets and liabilities. It will make the interview with the attorney go easier.
No, hire a lawyer, first. Gathering financial information is part of the case. If you have an easy way to get the information together, do so. But don't spend a lot of time trying to complete what you think is a thorough review of your financial situation. Let your lawyer help you with that.
Getting information on the business, the house, pension, etc. is usually done by a lawyer and the lawyer usually relies on outside help.
You DO NOT have to live separate and apart before filing.
Here's a link about dividing small businesses that will help; you can cut-and-paste it into your browser bar: http://www.illinoisdivorce.com/#!closely-held-corporations/c17by
If you are the breadwinner of the family, file as soon as possible. Maintenance awards are based on length of marriage. For purposes of maintenance, marriage clock stops upon filing. If you will be receiving maintenance, unless you need to get divorce right away, relax and celebrate more wedding anniversaries, before filing.
You have just to live separate and apart for 6 months by the time the divorce is final so you can file now. In terms of your financial paperwork you don't have to do anything with that until after the divorce is filed but you can certainly start getting it organized and together. You should set up a consult with a good family law attorney to get the ball rolling. Many offer free consults.
Your attorney will ask for the financial information, but it is not necessary that it be provided prior to filing for a divorce. Under current Illinois law, for grounds of irreconcilable differences, you are not required to live apart.
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