I havent' seen Body for Life but Anthony Ellis really knows what he is talking about. his webpage musclegaintips.com is mainly to sell his book, but its a pretty good read for ectomorphs like us. i also recomend subscribing to his mailing list too it has a lot of good info in his emails. i also really suggest looking at the max-ot routine at
http://www.ast-ss.com/max-ot/max-ot_intro.asp . its free to sign up with the website or you can print the copy from the DB forum. either way its the only 'correct' way to train. from what i've learned on these websites i've managed to put on about 25 lbs of muscle in the first 7 months( newbie gains but i'll take em). the gains have slowed down a lot now, soon i'll have to start actually counting calories an all that sh*t that im too lazy to do. Ellis put on something like 30 lbs in 3 months but i dout that happens with many people. it takes a long time for ectomorphs to make significant gains but once u start seein results you're hooked, at least with me.
good luck with your bulking