I believe you can start applying sometime in September. You have to send out a computerized application which includes your info, grades, and personal statement. Then you send the schools your transcrips and LOR's from a DPM before your considered for an interview. Usually the schools will get back to you within a week or two after you apply to set up interviews.
You will want to apply early so that you can get scholarships if you qualify. Being so early in the game, I would start shadowing some DPM's soon and start working on your personal statement of why you want to become a Podiatrist. When looking for a DPM to shadow, try to find one who had a three year residency. Believe me there is a world of difference in attitudes and practice between a newer POD with a PM&S-36 and an older one who only could get a 1 year residency.
Good Luck