Names- name-generator.org.uk has some good name generators to help.
Length- Doesn't matter, never choose the length before writing, because you'll either rush the ending or you'll write a load of bull to make it longer. Just write it until it's done.
Start- What kind of story did you have in your head? What information does the reader of the story need to know before the main events happen? Where is it taking place? Start there, then move forward.
