Here's a link to a few schools.
And here's a link to the FAR
that governs A&P qualification.
If you do the formal training route the minimum time you'll spend in class to get your A&P certificate is 13 months. Most schools require a min of 22 months. If you decide to learn on the job:
§ 65.77 Experience requirements.
Each applicant for a mechanic certificate or rating must present documentary evidence, satisfactory to the Administrator, of --
(a) At least 18 months of practical experience with the procedures, practices, materials, tools, machine tools, and equipment generally used in constructing, maintaining, or altering airframes, or powerplants appropriate to the rating sought; or
(b) At least 30 months of practical experience concurrently performing the duties appropriate to both the airframe and powerplant ratings.
That only qualifies you to take the tests.
§ 65.79 Skill requirements.
Each applicant for a mechanic certificate or rating must pass an oral and a practical test on the rating he seeks. The tests cover the applicant's basic skill in performing practical projects on the subjects covered by the written test for that rating. An applicant for a powerplant rating must show his ability to make satisfactory minor repairs to, and minor alterations of, propellers.
Once you have your certificate and are "certificated" you then must be trained and qualified on each task on each aircraft you'll be maintaining. This may be as simple as reading the procedure and doing it correctly or may involve substantial classroom time coupled with on-the-job training and proficiency demonstration. But:
§ 65.81 General privileges and limitations.
(a) A certificated mechanic may perform or supervise the maintenance, preventive maintenance or alteration of an aircraft or appliance, or a part thereof, for which he is rated (but excluding major repairs to, and major alterations of, propellers, and any repair to, or alteration of, instruments), and may perform additional duties in accordance with §§ 65.85, 65.87, and 65.95. However, he may not supervise the maintenance, preventive maintenance, or alteration of, or approve and return to service, any aircraft or appliance, or part thereof, for which he is rated unless he has satisfactorily performed the work concerned at an earlier date. If he has not so performed that work at an earlier date, he may show his ability to do it by performing it to the satisfaction of the Administrator or under the direct supervision of a certificated and appropriately rated mechanic, or a certificated repairman, who has had previous experience in the specific operation concerned.
(b) A certificated mechanic may not exercise the privileges of his certificate and rating unless he understands the current instructions of the manufacturer, and the maintenance manuals, for the specific operation concerned.
And of course there's always the need to stay current
Rest assured that once you have a Mechanic's Certificate you have only just begun your training. You'll spend countless hours in class and on the job learning your craft and trying to stay up to date with emerging technologies.
Then there's the constant instability of the job, workforce, and job security coupled with layoffs and ...........
§ 65.83 Recent experience requirements.
A certificated mechanic may not exercise the privileges of his certificate and rating unless, within the preceding 24 months --
(a) The Administrator has found that he is able to do that work; or
(b) He has, for at least 6 months --
(1) Served as a mechanic under his certificate and rating;
(2) Technically supervised other mechanics;
(3) Supervised, in an executive capacity, the maintenance or alteration of aircraft; or
(4) Been engaged in any combination of paragraph (b) (1), (2), or (3) of this section.
Okay we'll take that up some other time.
You might want to pursue the Air Traffic Control or Pilot careers. They're slightly more stable.
I don't want to scare you off but there's a lot of issues with anything involving the FAA and certification. Not to mention the possibility of losing your certificate or being fined for some minor infraction. It just keeps getting better...
And people actually wonder why very few high school students are thinking of entering the aviation maintenance field.
Whatever you decide, best of luck.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533