Not necessarily. Indenting at the beginning of a flash fiction is more of a style choice. You can if you think it makes the text more visually appealing or organized, but it's not mandatory.
It's best to keep the details sparse yet powerful. Highlight the most crucial aspects that give the story its essence. Remember, in flash fiction, every word counts, so make each detail count too.
It depends. Sometimes italicizing is used to give emphasis or set it apart visually, while quotes might be used to indicate a direct citation or specific reference.
You can try some fanfiction websites like Archive of Our Own (AO3). It has a large collection of Flash fanfiction that you can read for free. However, it's mainly for reading rather than watching in a traditional sense. Some fan-made YouTube channels might also have audio versions of Flash fanfiction readings, but this isn't as common.
One must - read Flash graphic novel is 'The Flash: Rebirth'. It's a great starting point as it reintroduces the character's origin in a fresh way and sets up new storylines. The art is amazing and really captures the speed and energy of the Flash.