This probably isn't an especially good forum to get help with what you're seeking. Private, not corporate ships brings to my mind the super yacht industry. And there are a number of
training organisations geared towards that.
If I could though suggest that in explaining your background, the reader will immediately recognise a lack of relevance in what you proffer. Few ships have farms whether cultivating plants, or animal husbandry, be they old
school or organic.
Not sure either what you mean by
Previous ones were chosen for building physical strength because I enjoy health and fitness. Previous ones, what does that refer to? Don't we all hope to enjoy good health and fitness? So I would also encourage you to read any post you
draft and read it back carefully, and in doing so ask yourself would anyone else reading it understand it.
Perhaps you offer attributes such as hard working, dedicated, loyal, honest, well groomed and presentable, no criminal background, drug/alcohol free, handle oneself well under stress, team player etc. I would list my attributes.
And consider the skills that a prospective employer would be interested in and drawn to, for example engineering,
navigation, fluency in another language(s), sea miles, nautical qualifications, ...
And I would also include the basics, age, nationality (passport), health, location, location you want to
work, work
history.
What I am suggesting is post a very brief CV. Good luck.