For newbies, I always suggest you use the same thread color in the bobbin and the top thread. It takes time to learn how to correctly adjust your tension. I usually quilt with the length of 3 and it is a good idea to replace your needle when starting a new project. I found it helpful to take a class at my LQS 20 years ago from Harriet Hargrave. I own her book which is my primary go to book in my library. She has come out with her 4th edition:
http://www.harriethargrave.com/Books...ition-p79.html