futureofficer,
If you know someone at a department, have them check the CJIS JOBFILE for dispatch openings. Most of those listings are also posted
here on MassCops.
Each department has its own requirements, but many are just looking for a high school diploma and a clean background. Prior relevant experience is probably the most helpful thing to have. Training is usually provided, since it is far less expensive (and much faster) than training a police officer.
Some of the certifications that help are:
APCO, CPR, CJIS/LEAPS, E-911, EMD, EMT
Some of those you can obtain on your own; others (such as CJIS and 911) require you to be hired by a department.
Good luck!
-Mike