Short answers: You file for divorce, and 6 weeks (42 days).
You should look at various pages of our web site (and the articles and other references posted on them) which will answer most of your questions:
You don't say whether there are possible issues relating to property, debts, kids, etc. There are materials posted on all those subjects, and more. You might want to start organizing your financial information using the Financial Disclosure Form, also posted on our web site.
You should probably seek consultation with an appropriate family law specialist. If you decide you would like to discuss this with one of the attorneys of this firm, please take a look at our consultation policies, procedures, and costs, at http://www.willicklawgroup.com/consultation_policies.
Sign up to receive a 10-part series of useful information and legal advice about the divorce process.