I am looking for online resources or books explaining how to develop prognostic indexes-scores step by step. I am mainly wondering about model validation and transformation of regression coefficients into scoring systems.
The following may be good places to start.
I particularly like case studies. Dr. Harrell's book has one on "Predicting Cause of Death" and "Survival of Titanic Passengers". Dr. Steyerberg's book has a number of helpful case studies as well.