To be a plumber, you can go to technical/vocational schools, you can hire on as an apprentice (usually with someone who knows you), etc. - but there are union problems in a lot of places, as noted by pluto.
The only real ways to support yourself as a philosopher (AFAIK) are 1) academia - teach, in other words 2) books, etc. - closely related to 1 and 3) working in some other field while pursuing philosophy in your spare time. If you want to go into academia, you’ll go to college (majoring in philosophy) and then graduate school (for a Ph.D.) and then hope like hell you can get a (preferably tenure-track) job in some school somewhere. Publish or perish, earn tenure, settle into a routine of teaching, occasional publishing, and university politics.
If you just want to do it as a hobby, go about it any way you want; the education you’ll need will apply to what you get paid to do, not what you do in your spare time.**
There are actual photographers on this list who can answer this better than I can.**
As I understand it - and this could be out of date, since it’s based on my aunt’s experience - you apply, and they train you. You need some college, usually. Oh, and there are some schools that offer courses for things like this - booking agent, etc. - but I’ve no idea how useful those places actually are. **
Yikes. Leave this one to the better-qualified-to-answer, but I’d say - college, connections, hope.**
College, followed by graduate school in architecture.**
Join the Navy. You’ll need a college degree to be a ship’s captain (I think), plus a whole bunch of other stuff - courses, experience, good ratings, whatever - that you’ll get while in the Navy.
Someone else can probably chime in with more info on a lot of the professions listed here; the academic route is the one I’m most familiar with.