The following is an excerpt from the CoachStart Manual.

Ask for referrals of the ones he/she is not willing to do; e.g., they can’t pay enough. Offer to go along and assist at their talks. Many really are open to this kind of help.  Or ask them what kind of help they could use.  Many new speakers apprentice, and again, a local chapter of the NSA is a great place to find a speaker that one can shadow.  Also, the local chapters of NSA have mentoring programs that match up new speakers with experienced ones.