Need advice on flight build

Can i know where you guys got the frienzy attack and lajutsu skill book before?
so that i can camp in those stages and try my luck there!

Got mine in jungle expert

I got the Iajisitu skill from Canyon expert 2 right after update. I haven't gotten Frenzied attack yet.

Can i know where you guys got the frienzy attack and lajutsu skill book before?
so that i can camp in those stages and try my luck there!

Advanced Normal skills, such as Frenzied Attack and Iaijutsu, are available from Advanced Normal Book Chests, which are available in any Expert mode map.
I don't know if any map gives a higher chance to see these and, from my own experience, there isn't. However, Jungle Expert map 1 or 2 are so easy that if you want to finish all of your Expert challenges in a short amount of time, do these as they also have a chance of giving you a Normal Advanced Book Chest in the wheel.
But try and think of another move that you may want and farm that book. You may see the Normal type chest one while doing it! Note that Sealed Space, as far as I know, does not reward Normal Advanced Book Chests as it already offers 2 different types (Ghost and Psychic).