OP, you sound a lot like me when I got started. I owned 3 other businesses and signage was costing me a fortune so I bought a vinyl cutter to start doing some of my own stuff. I am not creative at all. I'm a total left brain type of person. Once I made my first couple signs, I found a real passion for that end of things so over the next few years, I got rid of the other other 3 businesses and began doing this as my only business, only advertising through Craigslist and word of mouth since I also have real estate investments and at that time also had a full time job. I found that having individual customers come in was not for me because I couldn't design their pieces. I could lay them out if they knew what they wanted, but not do creative work. As a 1 man shop, that's a major ingredient I was missing. As it turned out, there are several small sign shops that are ran by creative individuals who hate technology or the costs/learning curve that is associated with them. Since then, I have changed my business to over 90% wholesale printing to the trade and am running a latex printer, eco-solvent printer, direct-to-garment printer, screen printer, embroidery machine, as well as finishing equipment out of a few thousand square feet climate controlled building I built behind my house. I have a 100ft commute to work each day and my dog hangs out with me. I'm not getting rich from it, but I enjoy what I'm doing and really, that's a lot more important. This coming year is going to be much bigger than last year, possibly double after having a customer that used a major wholesale to trade printer decided to shift all of his non-fabric printing over to me and we are working on another underserved market segment together to develop print products he can sell.
My point is, if you follow your passion and work within your talents, you can make whatever it is into something so don't let them tell you that the magnetic signs won't work. I will say that if this is all you are trying to do, you are trying to climb Mt Everest in shorts and sandals. Even if you make the best magnets in the world, Vistaprint does them for pennies and they are crap and will show it in 6 months, but you have to educate the consumer when doing the sale. A local sign shop I print for ordered full color prints from me for some magnetics and when I dropped them off, I saw what he was replacing. The materials and print quality weren't anywhere near what they should be for a quality product, and this one time, the customer found that he got what he paid for and sought quality, but that doesn't happen often. I'm in a suburb of Indianapolis. If you want to come hang out, I'll teach you what I know, but there are a billion things I don't yet know so make sure you learn from more than one person. As far as your printer is concerned, it is a decent machine. I imagine you got a good price on it because it's old technology. I have done that many times in the past and that's how I got to where I am now while only financing one piece of equipment. It is definitely not ideal for what you are attempting to do. Read more about what this machine is good at and offer those products to people. If you want to call me or pm me here, I'm happy to give you a lot more info than anyone else want's to read here. Good luck!