Here are some links to great information on fitting and alterations:
An alterations guide from Kwik Sew: download the pdf here
Lots of great articles on fit from Threads
From the Pattern Review site, Sleeve Fitting by Kenneth King
From the Sewing Divas, Adjusting for Full Bust on a Wrap Top, by Gorgeous Things.
Also from the Sewing Divas, Raglan Sleeve Cap Height Alteration, by Els.