Welcome to the quilting board. I hope you enjoy it here.
I don't know anything about embroidery machines but decided to take a look at the link that Barb posted. WOW! That's a great looking machine & the lady that demonstrated it was very good at explaining things. I was very impressed with the machine. I don't know what the 4 thread spool pins are for but will keep searching to find out.
Can't wait to see your first project finished!