My brother was an army med tech. He hated it. I'll try and answer your questions by relating what my brother told me.
1. typical day: you do what they tell you to do. Mostly non medical related duties. If they hand you a broom you sweep. A shovel, you dig. etc.
2. You'd work with people and things, like any job
3. Travel, yep. Right now especially, still have troops in afghanistan. If we are still at war, expect to go there. Otherwise, military moves personnel around often. That part I liked, my brother didn't like.
4. A lot of military life is hurry up and wait. Meaning, they tell you to hurry up and get there, and when you are there at lightning speed, you sit and wait. Really boring.
5. My brother didn't like anything about being a medical tech. He told me he wasn't allowed to do hardly any medical work. The quoted "we put bandaids on people fingers".
6. It depressed my brother. Thats why he left the army after only one term of service.
7. I don't know how long the army med techs trained. But in the Air Force if I remember correctly it was almost a year.
8. I don't know
9. My brother just chose it. When I was in the Air Force, my recruiter tried to talk me into the medical field, but it didn't interest me. However, I think the air force med techs do a lot more than put bandaids on fingers. I see them working in hospitals doing actual medical work! So you may consider the Air Force rather than the Army if you want the real deal.
10. Supposedly, you assist doctors, nurses in patient care. In war, you would help stabilize wounds until doctors can see the patient, i.e. apply splints, stop bleeding, help carry patients for transport, etc.
11. Stress depends on the situation. In battle, high stress. In peace time, depends on who you work for. A bad supervisor can take all the fun out of a job.
12. If its your passion, do it. Its not difficult to become a medical technician. However, you may wish to specialize in something, rather than a generalized med tech. Such as, Xray tech, physical or occupational therapist. Mental tech. There are tons of jobs specialists that would probably be more in demand when you leave the military.
13. My brother hated all aspects of the job. When he left the military he did not continue in the medical industry. He said there was nothing challenging in army medical tech. He was bored and told me the army offers you training, but they don't guarantee thats what you will do. So beware.
14. Just the desire to do it. Be prepared to work long hours with little rest. Be prepared to live in a tent. Be prepared to wear hot chemical warfare gear. Be prepared to do things other than medical duties. In other words, be patient. But no special prerequisites are required. What you might consider is 2 years of nursing training prior to enlisting in the army. The army has programs to help pay for further nursing school, and you could leave the military later, if you chose, as a Registered Nurse.
15. Yes. The military is not for the meek. Once you swear in, you are pledging your life in defense of your country. If you are needed on the battle field, thats where you'll go. If you are ordered to pick up a rifle and fight, thats what you'll have to do. There is no "no", in the military.