Well, if you go to the site you can see it's full of miscellaneous... stuff. Can't see how it's going to get an audience of any kind, therefore if you invest your time in it, it's likely to get shut down for lack of interest. Or that's my take on it.
I'd made it with something that can take a good beating, like canvas or denim; if you decide on nylon, remember that black gets really hot in the sun. If she has to sit on it, well, any fabric would do for that if she's, um, wearing clothes. You can always sew a different piece on the sitting-on part of it. The pattern looks pretty basic, lots of rectangles, you just have to sew them together in the right place, heh-heh.
Looks like you live in a really small area, not sure what FB or whatever is going to do for you, unless you intend to start shipping furniture around the state or country or something. The classes and things are all going to be local, yes? I'm just not clear on if/why it would be difficult to get local attention in a place that small. What's the online plan all about? Just selling the little stuff? I live in a small place now that's part of a 6- or 7-community county and there's a newspaper thing that comes out every week covering the buying/selling opps for the whole area. I would never know about most of these businesses if I didn't read that paper because most of them don't have FBs or websites. We also have a buy/sell/trade FB page and a news/ask-anything group that covers 2 counties and they get quite a bit of participation. I just found the perfect bank by posting a question on one of these. The more people can participate in your online ventures, the more they will like you. If it's just LOOK AT THIS AWESOME THING AND BUY IT posts, you're not going to get a lot of comments/participation no matter how many followers you get. Even posting a poll once in a while, or asking a question (If you could have one awesome piece of furniture, what would it be?) is a nice change of pace; maybe automatically bounce your blog posts over to your FB, but then you might be setting up a FB vs. Blog competition. Moral: There is no one best way to get customers or online traffic.
I have a little ceramic dish I thrown pins into - I only like those daisy-topped ones now so they're easy to grab, and needles - don't do much hand-sewing at all - i just keep stuck in a cheapie green tomato. I don't like magnets, I know some folks swear by 'em.
My mom taught me a few things, and Home Ec class taught me a few things. The first interesting project I remember is turning my mom-approved straight jeans into rockin bell bottoms! I don't really have a passion for sewing, I just like to make things happen when I can't buy what I want (awesome curtains that don't cost a million dollars) or wear what I want (have narrow shoulders and big arms, um, yay, thanks genes!). I started sewing again after a 30+year hiatus because I wanted to make my own bags, and recently moved onto shirts.
You pretty much find that kind of service in every department at Walmart. Last time I got fabric there is was a 20 minute wait with 3 different people calling for service. Turned out the gal who was supposed to man the dept got moved to grocery for the day, and she thought someone else was answering the calls, but it turned out that person disappeared, no one was sure if she was on break or what. The backup systems and cross-training is extremely flawed. I actually have an application in to work there since the one in my small town pays pretty well just to keep people. I hope to discover The Mysteries of the Missing Staff one day.