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Most lawyers (law firms) will provide a one hour free consultation. Before you go, gather as much information as you can (tax records, bank, all assets, etc.). Also, do you have a joint bank account? If so, when you are ready to make your move, take 50% of what ever you can. You may have to visit a few attorneys, but find one that will ask the court for your husband to PAY your attorney's fee. Given that you have a long term marriage and four children and have always been a stay at home mother, the judge will award you child support and spousal support.
Divorce is not easy and can be especially difficult at this time of year. Be kind to yourself, pamper yourself and focus on the future.
Blessings....