1. It's as Neck-Romancer said.
2. There are 20 memoir pages. The locations are in here: /t/7003564/any-listed-guidelines-for-all-memoir-pages
Turn in the pages at Branch castle's librarian, then go to Kokkol.
3. Vomammoth fang is a drop only item from Vomammoth living around Babil tower. Equip anything that increase item drop rate (Kumoggo's Jewel and Lyric's advantage card) and farm them.
4. About Tower of Babil, it's as Neck-Romancer said. The locations of weapon fragments are in here: /t/7047959/the-4-weapon-fragments-location-guide. Bring the fragments to Arazlam's house. A small house south-west of Hillsdale.
5. The total number of marks is 48, (42 normal, 6 Elites)
6. We don't care much about the relic since Bosch's procure is unreliable. lol But we have some of the relic locations here: /t/6985414/bosch-relics-items-for-procure-command
7. The only clue I found is that an NPC said you can sell them for a good price. :/