Jillyissilly88

How do I clean and store molds used in slip casting?

If you're looking for a more lightweight option, hollow legs with a metal rod inserted after firing could be a good option. This will help to reduce the weight of the legs while still providing enough strength to support the glass top. 
If you're looking for a more traditional option, solid ceramic legs could be a good choice. Solid ceramic legs are usually thicker and heavier than hollow legs, but they can provide more stability and strength. You'll want to make sure that the legs are thick enough to support the weight of the glass top, so you may want to consider using a thicker clay or adding extra layers of clay to the legs.

Doing workshops and teaching classes are two different animals. Workshops are a good way to make some extra money, but you don't get the chance to do them until you're fairly famous because it's your name that's the draw. There may be others out there who make work that is just as nice but no one is going to pay money to go to a workshop if they haven't heard of them. It's also not something that you can do every week all year long. There's just not that kind of opportunity, and it'll eat into your studio time. One of the nice things about the internet age is that you can do online workshops, however you still need the name recognition to get people to sign up. The vast majority of potters do not do workshops on a regular basis, but they're great when you do get to do them. You can make a few hundred bucks for a day's work, plus sell some pots and meet a bunch of other potters. They're a great ego boost, too!
Teaching pottery classes does not pay much. Many people who teach are paid in studio use, kiln use, clay, etc. If they are paid actual money it's not usually very much because they're paid for contact hours, and classes are usually only 2-3 hours once a week. Even as a studio owner you have to offer a lot of classes for it to be profitable. My classes cover my monthly expenses plus a little more. It would not be profitable on its own to a degree that was worthwhile unless I offered 3 times as many classes as I do (I currently have 4). That many classes would require hiring a couple of helpers, and working all day on Saturday, which is why it's never been the sole focus of my business.
College level teaching is a sweet gig if it's an environment you enjoy. Time off, benefits, etc. Personally, I would love a college job, but when I got out of grad school I was burned out on the academic world and didn't pursue it. After a time is was simply too late to start that career. Most college jobs will require you to move, because there are only a handful available each year and chances are they're not in your town.
My business survives because I have 3 income streams- teaching, selling my work, and kiln sales/repair. It was the best way for me to get the business going and now I'm settled into it. With some changes I could make a go at any one of them on its own, but I really don't want to. It fits the way I like to work, and works really well with my home life. The downside is that kiln repair and studio time can fluctuate a lot. Repair work has been crazy lately, so studio time has been virtually non-existent for the past few months. Financially it all works out just fine- money is money- but I do wish I had more time to make pots.