Before you start your program try doing some research on it, look for anecdotal of students that have been through the program, and college reviews online. Game Design programs have been popping around colleges and most of them are a scam. Unless you're willing to go the extra mile and be basically a self taught student or you're just doing it for the degree, then it's not worth it.
Have you decided on a specialization yet? It is something that you want to do early so you put the most work towards it and develop your portfolio around it.
Other than that; good luck, this is a tough field and you're going to need it.
As a retired math professor, I can tell you this, every university out there is a business first. This means getting and keeping your tuition is job one for them. For that reason, the above recommendation is sage advice. As with any education, what you get out of it is closely related to what you put into the process. There are two things you are aiming for when getting an education, one knowledge and two connections within the industry you plan on entering. For this reason I would not recommend an online education. Connections are harder to foster in that environment.
In many 500 level course textbooks for game designer you will find the NWN2 (or the Aurora toolset that is included with the game) is often mentioned as a way for a new designer to show off their game ideas to prospective employers or investors. Many in-school projects at this level require this (or another) toolset to be used.
As many have pointed out, bringing a game to live takes a large team and there are many professions within that business. A clearer understanding of what role you wish to play in this profession might help in directing you for not only your educational goals, but also your long term goals. This will also prove to make your educational dollars more fruitful.
The fact that you have played games for over 24 years may lend itself to a fabulous and successful designer career.
Most game engines work on the same principal, and showing your ideas and work in this medium will give people an idea of your abilities to create and work within that environment.