I am a recent semi-convert to wood arrows, as well. For what it's worth, here is what I gathered, right here on Trad Gang --
Spine "rules of thumb" -
*Add 3# per inch, each inch past 28" draw.
*Add 5# per 25gr point weight over 125gr.
(Not sure I agree with this yet, still experimenting.)
*Add 5# shelf cut to center, 10# cut past center.
*Slightly stiff is better than slightly weak.
Use this link for a "how-to" on building, i.e. straightening, prepping, staining, cresting, finishing, etc. There are several in the "How-To" archives here, but I found this one simplest and clearest for beginning.
http://tradgang.com/noncgi/ultimatebb.php?ubb=get_topic;f=2;t=000119 I started with POC shafts, and really focused on straightness before I started finishing. So far, they have remained surprisingly straight, with regular shooting (100-150 shots per week). I have sitka spruce shafts ordered, just to experiment with other woods.
Hope this helps add to the info pool for you. Good luck, and have fun!