Overall, the ending of Hells Paradise ties up most of the storylines. It brings closure to the conflicts and character developments, but leaves some room for interpretation and imagination.
You can start from the chapter where the anime ended. Usually, there are online forums or manga communities that can give you specific chapter recommendations.
Well, Taiju does confess to Yuzuriha. It happens after a series of events that build up the tension and make the confession quite impactful. The scene is beautifully depicted in the manga.
Well, it depends on what you consider 'good'. There are some 'naruto x yuzuriha fanfiction' that focus on adventure, where they go on quests together. Others might be more about their relationship development. You really have to dig in and read a few to find the ones that suit your taste. For example, some might have Naruto teaching Yuzuriha some ninja skills, which can be really interesting to read about.
I don't know the specific author of a particular 'Hells Angels Novel' without more context. There could be multiple novels about them written by different authors.
I'm not entirely sure as there could be various novels related to Hells Angels. Generally, it might be about the Hells Angels motorcycle club, their lifestyle, values, and maybe some of their adventures or the darker side of their activities like illegal stuff or their code within the club.