1 ply vs multiple ply

I am thinking of making my own blade with my grandpa in the near future, as he loves woodworking and I thought it'd be good bonding. But I'd like to know if there what the general upsides/downsides of singly ply vs multiple ply are, and also which sort of wood that may be acceptable to use to make it playable, as I'd actually like to use it. I'd like the blade to have just above average speed, but not a rocket. Do you know anything about this? 

I've heard hinoki is good, but I dont know where to source it.

Also I was hoping to join as a premium member, but I dont know if I'd have enough time to keep up with the lessons and make the most of it, and also if I have enough facilities. How much time would be recommended a week to keep up with practising, considering I am currently able to get about 60% forehand on, so beginner level, but I believe I am a quick learner?

Kind Regards

Duncan