Keep your head down and do your homework.

First, be as quiet as possible about your new windfall. While selling your company may be public knowledge, keep conversations about your finances and situation minimal and confidential until you have a plan. The more hushed you keep your new financial situation, the less pressure you may have from others asking for favors and handouts.

Additionally, do your research before making any decisions. While you are coming to terms with your new wealth, search for the right team, including a financial adviser, attorney, and accountant, to help you set your goals, both long and short term. This may include tax efficiency and structure, such as trusts and family limited partnerships.

Research a potential advisers' philosophy, fees, and expertise. Have a background check run on anyone you hire, including their financial situation. Review your engagement letter and understand the small print. Be patient as you search for the right team — they are extremely important to your future.

Find an adviser you trust.

Part of your team should include a financial adviser who can be an invaluable resource during this time and into the future for many reasons.

First, he or she can help you identify potential present and future financial goals, plan for the next generation, and structure an income stream, which will ultimately help guide your money to survive you. You might find yourself in the unique position to make donations you have only dreamed of, and that, too, requires guidance.

A financial adviser can also help when friends and organizations are looking for financial contributions from you. Sudden wealth often leads to many changes which are hard to anticipate. Do not let your guard down. Family and friends can come out of the woodwork. Also, be aware of frivolous lawsuits and threats. Keep you and your family safe.

Don't go crazy.

Be disciplined in your spending. Some pro-athletes and lottery winners have filed for bankruptcy after blowing all of their wealth. Do not fall into this trap.

With the help of your financial adviser, you may decide to put your money where you cannot access it easily, such as a house or a 529 savings plan for your children's college. Or, you may decide to have your financial adviser help establish a salary for you each month so you can control your cash better.