I need to be able to specify and edit/regulate such things as:
  * with emission, with a certain amount, editable in the future
  * with additional emission

  * certain precision after a comma, say, 5 digits
  * a) the price is regulated by market; b) or the price is set manually in USD or ETH; either a) or b)

  * with presale, with ability to pause sale


... and other requirements.


Q:

where do I even start?
What should I read?

Are there  simple real examples that implement some of the requirements, be it code at github or decent tutorials out there?

P.S.

I'm a developer.