Flowgraphs should be translated as Lua scripts, but perhaps performance is lost somewhere else ?
For beginners, they will need to dig general tutorials on game making, and yes a new comer to 3D that didn't use scripts and 3D egine,s it can be hard for these sort of people.
I think some 3 rd person platforming game tutorial would be great before FPS ?
(Like Unity 3 rd tutorial covering aspects form level making and design, placing lights, managing the character and bad ennemies at last).