Tartan gives great advice, call the store for a list of supplies and what you need to bring. A rolling luggage cart would make transporting your machine easier. Your sewing machine is just fine, it's what you use and I seriously doubt that any quilter with a very high end machine would bring it to a class, at least I wouldn't. Quilters are very special people, generous, thoughtful and welcome new quilters regardless of their skill level. Go, I'm sure you will have a great time and learn a lot. I've been quilting for many years, but every time I take a class I learn something new, so go and enjoy.