I'm not sure how to explain threading it, so you'll have to look on youtube for a tutorial for that. Anyway, I know a lot about everything else. You know how there's a peddle that's connected to the machine? You put your foot on it to make the needle go.
But first you put what you want to sew underneath the needle. You probably know to do this, but I'm not sure, so make sure you sew on the edges of the fabric (well, it depends what your making, but on most projects, you should do this.) When your ready to start sewing, pull the lever that's behind where the needle is down so that the foot clamps down on the fabric, put your foot down on the peddle, and your basically ready! Sorry, that wasn't a very detailed descritption, so you should probably also look at youtube tutorials.
~ Trying to be helpful but probably being foggy in explanation, Gilly E.