Depends on what part of the country you are from.
A Med Tech is a MEDICAL Technician, which is--depending on where you live, the same thing as a Certified Nurse Assistant, a Medical Assistant, a Patient Care Technician, and depending on what department you work in can be an Emergency Room Technican. Every unit has their own rules about what a Medical Technician can and can not do. If you work in an MD's office the lines get even blurrier. Mostly, it is patient care based (and there are some Medical Technicians who are allowed to do some more advanced technical things, some who can draw labs, some who even insert foleys......) but that is not everywhere--and you need to get a job description to see what this all means, and what you are required to do. An ER tech is usually an EMT or a paramedic, and does (or not) some wound care, EKG's, labs.....
A Medication Aide is a different certification. And again, dependent on where you would be working, usually do not pass meds in the same way a nurse would. They are usually utilized in Assisted Living or the higher functioning units of LTC or Skilled Care--even in halfway houses for mentally ill clients. They observe residents taking their own medications out of a pre-poured medication box (that is pre-poured by an RN or an LPN). With that being said, a Medication Aide is usually a program assistant or a CNA that has additional certification as a Medication Aide. In some states, it is a Department of Mental Health or State certification, in addition to being a state certified CNA.
Either way, I would start as perhaps a CNA, and take whatever additional certifications that you can once you are one. Or see about if you are a nursing student, if you could work in an MD's office as an assistant.