Juki 8300N. I have a JUKI DDL-8300N Model. I have had it for several months and never used it.

Question

I have a JUKI DDL-8300N Model. I have had it for several months and never used it. Last evening I tried to get it running and had several problems. First of all the thread kept breaking. I think I got that resolved but now the needle comes unthreaded. It will stitch a stitch or two and then become unthreaded. The manual I have is not very user friendly and I cannot figure out the problem. Can you help PLEASE!!!!. I have a project that is due tomorrow to a customer and I really need my JUKI to finish.
Rosemarie