Who should be partnered with to bring watch design to life?

Question

Android

There are several clock visualization ideas. Both in terms of design and in terms of implementation (for example, hours with a non-standard breakdown into divisions, by time of day, etc.). Since I don't know PL, but it seems irrational to figure it out myself, a number of questions will arise:
• Who writes software for smart watches, androyd / ios widgets?
• Is it easy to port written code between environments?
• what are the guarantees that the authorship of the idea will remain with me?
• How easy is it to monetize such ideas?
====upd====
Forgive me for my disorientation in the IT environment, but the last time I touched Pascal was 15 years ago, I knew how to write "find the greater of the two" and now I remember little. And therefore, they are completely unaware of where anyone lives today, on what resources and on what they code. Give at least basic guidelines, if your friendliness allows it))

Answer 1

What are the guarantees that the authorship of the idea will remain with me?

Ideas are not protected in any way. Implementation only. And to cooperate with any developer of mobile applications.