Drop down menus

I am turning to the forums for help again; I have been assigned a task which is becoming a nightmare. This is the situation, I have tried numerous times and for some reason I am doing something wrong or the Microsoft web site is not explaining it clearly. I have a list of Insurance Companies, and their multiple plans that they offer. I want to create a worksheet that can help me do the following. If I were to select one of the Insurance Company, I would like a list of only the products that the company has to offer, not every ones else plan. Then I would like to be able to choose the plan that I want and have the specifications pop up into certain fields. I know I need to create a master worksheet with all of the Information on one and have another worksheet as my form. If you can please help me this would be greatly appreciated. I am just really confused on this, and I need help. Thanks so much.