Please take this advice with the greatest of concern.
Do NOT try teaching! With no interest or experience, it would very probably be a bad thing for all parties. If you get some background/training in it first,
maybe.
Your employer will always have to arrange your visa when it's your first one. They sponsor you for it.
USP = unique selling points? I'm sorry, but I really have to be up front on this. Your nationality holds you back from the visa. An employer might think you are the greatest thing since sliced bread, but
immigration will be the barrier to overcome. (That goes on
top of my earlier comment.)
I got into teaching from a totally different line of work, one which involved a modicum of teaching experience in university and training international personnel in a U.S. company both in America and Japan. I came to Japan to teach English as a stopgap, stepping stone, whatever, but even though I am American (a desired commodity in the EFL world), and someone who is pretty darned good at my language, I had the good sense to get some training in EFL theory first by taking a series of courses for 6 months, ending in a certificate of completion. Even so, with all that background, I consider myself lucky to have gotten as far as I did. I landed an eikaiwa job first, went into part-time classes on my own and at a private high school, and then because I had a science background and advanced degree, I managed to get a tenured university job. From what I gather, you have none of those things, and I honestly don't see what kind of "USPs" you feel would compete with the majority of teaching job seekers. Impossible? No, just darned difficult. I write this with a little tone of indignation because it really sounds as if you think this "USP" notion is something that will allow you to breeze right in and snatch up a job in teaching. In my opinion, it won't. Worse, your attitude/disinterest in the profession makes you a very poor candidate for success, and that will affect your students, coworkers, surrounding staff, and all other teachers in this country.
You want an "office job" related to international sales and marketing? Use your talents, experience, skills, etc. plus learn a little more than a taste of Japanese language to make yourself properly competitive. Look at the
Career Cross website for advertisements in your career just to see what the requirements are -- Japanese language ability is usually a big one. Go also to the
外資系転職求人サイト[Daijob.com]外資系・英語求人10000件! website and see what Terry Lloyd has written in many brief informative news articles about working here. Contact him directly, too. He's very reliable and knowledgeable. And for goodness' sake, look up the
visa requirements for the various work visas you might be eligible for.