check out this site...
http://www.thebackcountry.net/
the backcountry guidebook on there give you a good idea of where to go... theyve got a store in truckee too
i want to try it.. never done it! all season ive been thinkin about hitting up castle peak or donner ridge... also i hear u can get a cheep 1 ride lift ticket at sugar bowl and ride up mt judah and hike from there... you have access to the whole donner bc from there.. u can prolly get to the railroad if u wanna gap it