First thing to do is try to protect your invention by filing a patent. You can go up on http://www.uspto.gov and there are step by step instructions on filing a patent. There are also searches you can perform to see if the patent already exists.
Be very careful because the actual wording of the patent is very important and in the future can be a source of difficulty in case of litigation. So you may want to invest in the advice of an attorney who is knowledgeable about your invention as well as the patent process itself.
Try joining associations since they will address many of the questions and concerns you’ll inevitably have as well as many you haven’t anticipated yet. See the list below:
International Federation of Inventors’ Associations
United Inventors Association
Directory of Local USA & Canada Groups
Here is also some recommended reading:
The Mom Inventors Handbook: How to Turn Your Great Idea into the Next Big Thing