Spartathlon Training Advice
You might have read Bob Hearn's reports. If not, highly recommended.
No idea what your running background is. The Spartathlon requires a experienced ultrarunner who can perform without crew and any hand holding. Pacing is crucial in this race. This is by far the most difficult ultra there is. Cut offs are tight and there is no wiggle room if something goes wrong. Just to make the overall cutoff you have to run 4.25 miles per hour including all stops.