Also, check to make sure the bobbin case is in properly. I found out when I took mine apart to clean it there is a trick to getting it back in and if not done right then sewing is a major problem. Luckily, what you need to know is in the book. Also, it matters which direction the bobbin thread goes in matters too.
Congratulations with getting the FW. I really enjoy mine. Just when you take it traveling, be sure to take your sewing machine oil too. My little machine wants oil every day.