Here is a link to the question "How do you write a book or novel?" - it will tell you all about writing a book. As to the fantasy part, you need to read enough fantasy to know what that would be.
a book with fantasy and imagination
The Book of Fantasy was created in 1940.
it is a fantasy book
Yes- to consider a book a fantasy book it must have a story that has fantasy elements in it.
Here's a link to show you how writers think up ideas.
J.K. Rowling will not write another Harry Potter book. She said she will continue to write but is probably done with fantasy because she doesn't want to borrow to much from Harry's world.
The ISBN of The Book of Fantasy is 0-670-82393-7.
You might check EXPOSE or EXOTIQUE book collections. There are also many other books covering fantasy art (used in fantasy movies, fantasy book illustrations, fantasy games..)
This is a fantasy book
yes
Yes.
No it is fantasy.