contract wor is a good start, Yes, call him

Prepare what you are going to say before you call.
Actually there is no big difference for a FTE or Contractor for this kind of position.

Hi Don,
This is Minnie.
I am so glad to know you are going to bring me in as a contractor, Yes, I think this is a good chance for me to show you how good I am.
Would you please let me know how soon can I start?
Thanks!