1. Here's one from Leigh-Ann's Freckled Nest (she's adorable) about the parts of a (general) sewing machine and threading a bobbin:
P.S. I don't load my bobbin into the top like she does. My older machine has me load bobbins into the side, as you can see in pics from Ruffles and Stuff:
Actually, "Ruffles" and "Freckles" (as I shall refer to them) give excellent step-by-step directions for winding and threading your bobbin for the first time!