As to your second two questions.
Knowing how books in your genre (sub-genre actually) is always a good idea. Though I am going to nitpick and say other authors are not your competitors. It is not like readers only buy one author. I have yet to find an author that has the output of what a voracious reader reads.
As to your good time question, there is no real good time or bad time. I don't know what genre you are planning on but if you ask 10 authors, you would get at least 10 different answers.
I have heard x y and z are bad days. I have also heard x y and z were great days.
Same days, same genres, different authors.
Other little tip, you cannot just put a book on Amazon and expect it to take off.
If someone says give me $200 and I will publish your book and it will be an instant bestseller, RUN. Get as far away from that person as possible.
Note: A bestseller is one that is in at the very least the top 100 in all of Amazon not say
Household-cooking-slow cooker-Tasmania.
I do believe and I may be wrong but I think whoever publishes the book gets paid by Amazon and they pay you.
Anyway good luck.
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