Mr. Smith, this is the beginners forum, most beginners don't scratch build there first airplane and wouldn't know where to even begin. You should post your questions over in kit building or Scratch/plans building. That Way you will get a number of the better places to find wood, plans and general supplies at the better prices.
I am a scratch/plans builder myself and use several places to buy the items needed, if you search around you will find a number of people posting this information already. I think if I were you I would change the location of my question.