It seems like you need basic info first, so I'll toss you a few links. Keep in mind this is just the tip of the iceberg - there is ALOT of info available
http://reptilis.net/serpentes/venom.html
http://faculty.etsu.edu/currie/venom.htm
http://sulcus.berkeley.edu/mcb/165_0...ipts/_713.html
http://www.kingsnake.com/aho/pngsmc/Chapter%203%20Composition%20of%20PNG%20Snake%20Ven oms.pdf#search='venom%20digestion'
http://www.cals.ncsu.edu/agcomm/maga...ter02/zero.htm
That should be enough to get you started