One good 'Naruto and Flash fanfiction' could be 'The Flash in the Ninja World'. It has an interesting plot where Flash somehow gets transported to the Naruto universe and has to deal with all the ninja stuff. It's a fun read as it combines the super - speed aspect of Flash with the unique ninja skills in Naruto.
The plot could start with Naruto being experimented on by some unknown force that gives him the Flash's abilities. At first, he struggles to control the speed as it's completely different from his chakra - based powers. But as he trains, he gets better. He then uses his new speed to outwit Orochimaru. He can quickly dash in and out of Orochimaru's lair, stealing important items or rescuing hostages. This would also change his relationships with his friends in Konoha as they are both amazed and a bit wary of his new powers.
Kakashi Hatake would be a great character to pair with the Yellow Flash. Kakashi was Minato's student, and there could be fanfictions exploring more in - depth training sessions or missions they went on together that weren't shown in the original series.
The 'naruto the new yellow flash fanfiction' could be a story that delves into the concept of a new Yellow Flash emerging in a different era of the Naruto world. It could explore how the ninja world has changed since the time of the original Yellow Flash. This new character might have different challenges and opportunities. They could be involved in political intrigues within the ninja villages, or they might be on a quest to find out more about the secrets of the Yellow Flash's power and how to use it in new ways to protect their village and the people they care about.
If Naruto becomes the second Yellow Flash in the fanfiction, it would likely have a major impact on his relationships. His friends might be in awe of his newfound ability, and his enemies would surely fear him more. Also, it could change how he approaches battles. Instead of relying solely on his Rasengan and shadow clones, he could use his speed to quickly outmaneuver opponents and strike at their weak points.
Fanfiction.net is also a good place. There are many writers who post their 'Naruto and Flash' fanfictions there. However, the quality may vary, so you might need to do some digging and read the reviews or summaries before choosing a story.
The key element is Naruto's motivation. He needs a strong reason, like facing a super - fast enemy or wanting to improve his combat abilities. Another element is the integration of Naruto's existing skills. Since he has great chakra control and unique jutsu, he would combine them with the concept of Flash Step. Also, the training process is important. It should show how Naruto overcomes difficulties in developing this new technique.
One way to write this fanfiction is to give Naruto a reason for creating the Flash Step. For example, he could be in a battle against an enemy who is extremely fast and elusive. Frustrated by his inability to keep up, Naruto decides to create a new technique. He starts by training his body to be more responsive and his reflexes to be quicker. He could also seek advice from other fast characters in his world, like Rock Lee. Then, using his creativity and knowledge of ninjutsu, he combines different elements to form the Flash Step. It could be a jutsu that requires a large amount of chakra at first but becomes more efficient as he masters it.
Some fanfictions might focus on Minato's early days as a ninja. For example, his time as a genin when he was just starting to discover his incredible speed. It could explore how he coped with being different from his peers and how he developed his signature jutsu from those early experiences.
Obviously Naruto would be one of the main characters. Since it's about him flashing to the future, he is the central figure through which the story unfolds. Sasuke could also be a main character. Maybe in the future, he has his own new goals or challenges that Naruto has to either help with or oppose. Sakura might also play an important role. She could be a powerful medic - ninja in the future and be crucial in treating the injured during some sort of conflict.