Because there are multitudes of wand shops and everybody comes from different countries, this is not necessarily Ollivander's Wand Shop. Regardless. Pick your wand or staff or whatever it is you're using and attach it to your character bio.
Pick a type of wood, it doesn't matter really.
This has a good list thoughhttp://www.fanfiction.net/s/7136712/2/HP-TUTORIAL-1-WANDS-AND-WAND-CORES-UPDATED
Up to page 4
Little more picky here. Has to match your character's personality.
If you make one up, bring it up to me first. Alternativelyhttp://www.fanfiction.net/s/7136712/5/HP-TUTORIAL-1-WANDS-AND-WAND-CORES-UPDATED
Up to Page 6
Should be similar in regard to full height as an adult (Hagrid being a half giant had a wand of 16 inches long)
As above. Also note resilience. (Stiff, springy, etc.)