[X] Kiba's right. You need to narrow your search. Instead of just researching the era, you'll focus on one specific thing.
-[X] Map of clan territories 5-10 years before hidden village establishment and descriptions of their relationships.
Regarding the history project:
I think we need to focus on something. Maybe the time period 20 years pre Konoha until founding?
So... basically the time period surrounding Hashirama and Madara's early life prior to founding Konoha?
Of course, we could also rely on fragments of canon knowledge, via that Perk we have to help fill in the gaps.
Another clan kid feels like it'd work best. I'm half tempted to rope in Sasuke, or if we want pure book smarts Shino might be a better idea. Though, both hinge on them actually accepting.
I believe Sasuke is already on board with helping us with the project, according to canonical omake submissions. Shino... we'd have to figure out how to get his aide.
And it just sounds supremely badass for Daisuke to mix in precise and deadly nin- and gen-jutsu with one-handed seals while holding a badass sword.
True enough, though, it's a matter of mastering the jutsu in question (and ninjutsu theory in general), than it is about using jutsu that only require one-handed seals. Practice and familiarity allow experienced ninja to cut down on the number of seals required, and even do the seals one-handed if they have to.
So... I imagine leveling up Chakra Control and Shape Manipulation would be the way to go, as well as mastering all these jutsu till they can used at that level.
Thousand Flying Water Needles of Death
Water Release: Water Severing Wave
Water Release: Rising Water Slicer
Thousand Flying Water Needles of Death is a B-Rank jutsu, and also classified as a Secret Art - we'd need to steal it from Kiri somehow. Water Severing Wave was Tobirama's jutsu - it's unranked and likely a personal technique of his, but powerful enough for him to use it to cut through the God Tree... Rising Water Slicer might be doable, but would not be as powerful as a similar Wind Release we can use to synergize with Kenjutsu, not to mention reliant on having a bunch of water around to use the jutsu with - we're not Tobirama, and able to just create that shit out of thin air.
Wind Release has a ton of synergy with sword-fighting though, as displayed by Danzo. I agree, Water Release is baller, but Wind Release has more synergy for our fighting style. We can use it with sword and taijutsu, and rely on it to cover our deficiencies in long-range combat, Not to mention, wind jutsu can be nigh-invisible because they're the same color as Air. It's how Baki made a name for himself, and Danzo proved it's deadly as hell.