This covers the basic equations for noise and more advanced analysis  but it distills down most of the analysis into good rules of thumb.

https://circuitsaladdotcom.files.wordpress.com/2012/09/noise-in-amps.pdf

The highlights include:

every 1K orf resistance adds 4nV/Hz noise.

noise adds as the sum of squares… so – larger sources dominate and large gain in the first stage minimizes noise contribution in later stages

Source impedance needs to be considered in  terms of its effect on op map current noise( often ignored)