I'm guessing it's enough to make a difference but probably not enough to totally change your lifestyle. I certainly do not need to know how much. In some ways your life may have just gotten harder but some problems are nice to have. Congratulations. Good things do occasionally happen to good people.
You probably have the accounting and tax preparation in hand. I'd suggest both a financial advisor and a lawyer. I don't know who your wife knows, but get one and get someone they are used to working with for the other, though they probably won't interact that much with each other. Your wife will probably interact a bit with the financial advisor in setting up accounts and investing the money. You may even get involved with some of that. The attorney is more to set up trusts and draw up a will if you don't have one. Many fortunes are lost because the inheritance is not set up right though your immediate interest is saving as much on taxes as you legally can. You might check to see if Publisher's Clearinghouse has some advice about that. They just might.
I guess I'll tell my story. My wife's great grandfather used to be one of the richest men in his state. When he died his lawyers had it set up so the tax hit for his wife to inherit wasn't too bad. But she died unexpectantly a couple of months later. Most of that fortune was lost because the lawyers were sitting on their behinds instead of getting her affairs in order.