I've recently worked on a project involving Logistic Regression. Although I've managed to 'complete' the project, I'm unsure whether what I have done so far is correct and/or sufficient. It is a case of regular binary logistic regression. One dichotomous response variable and several (approx 30) independent variables.

I basically used the proc logistic code to get the output and removed all variables for whom p value was > 0.05.

However, I was wondering if someone was able to provide a list of steps that need to be performed in Logistic Regression from start to finish (don't need to detail them much as I will try to find more about them on my own) in a list. e.g. do I need to perform diagnostics of some sort before running up logistic regression? etc. I read about correaltion matrix and frequency tables etc but I don't know if and why i need all that and much more perhaps?

Also, is there a good dedicated clear source (a book or online source) that explains every little detail about using SAS for logistic regression including the code and how to read the output?

I've consulted multiple resources (many books) but none has been "complete" or detailed enough in providing the information I need.

All help is appreciated.