Marjorie,
Welcome to the Grumble!
I have to say that you are biting off a very large chunk of the sandwich when you decide to add framing to a new business based on a one day workshop. It would take alot more than that to get me to commit to the investment that is required to operate an efficient shop anywhere.
True, there are comments on this forum that are on the negative side of using a vacuum press as a form of mounting for certain artwork. I happen to use a Seal vacuum press and have for the last 16 years. You need to educate yourself on the proper use of a vacuum press and which type of images or materials are suitable for vacuum mounting. It isn't just the act of buying equipment that makes you a framer as is indicated every week by classified ads in many art related magazines, eBay, and other sites on the internet. You need a background in how to use that equipment and what to use it on before laying out all that cash for something that you are not sure will give you a return on your investment.
There are many who went into framing through the years cold and made a career of it, myself included. But I would not recommend the "trial and error" method for anyone unless you are quick with "home schooling" and pick up on everything that you read and are shown about the various techniques in matting and framing.
The business is changing rapidly and the fact that you can cut a rectangular hole in a mat or build a frame doesn't automatically make you a commercial framer. I would suggest alot of study, attending all the workshops that you can find at trade shows, talking to experienced framers about going into framing, and reading all that you can get your hands on before purchasing thousands of dollars of equipment for a fully outfitted frameshop.
Join the PPFA, subscribe to Decor, Art Business News, Picture Framers magazine, and read, read, read! Make the Grumble a daily stop and go into the archives and find topics on things that pertain to framing. Ask questions on this forum and pay attention to what others say on each topic that is associated with custom framing. There is alot of foolishness and joking around here but there is a wealth of information here also. We are like a big cyber-family here on the Grumble and we kid around and tease each other as any family would do. But we do get down to business occasionally also.
I wish you the best of luck in your plans and dreams. BTW, if you haven't drawn up some kind of business plan yet, I would recommend doing so. You need to have some kind of general plan as to what you want to do with your new business and how long it may take to accomplish these goals.
Again, good luck.
Framerguy