You talk about veeerrryy wide subject. "Microwave oscillators!!!"
Which frequency you'll use ? Which topology wil be useful for you ? It will be in a IC or on a PCB ? etc etc..
There is no "rule of thumb" or " to do list" for the oscillators.
Oscillators are designed by considering
-Frequency of Interest
-Topology ( BJT,FET,SAW,VCO,OSC+PLL,DRO,Cavity,etc etc..)
-Output level
-Cost
-Phase Noise
-Pulling
-Pushing
-Drifting
-Offset
etc etc..
I suppose you that first read a good Book about oscillators like
I.Bahl , P.Bhartia," Microwave Solid State Circuit Design" J.Wiley
Vendelin G. " Microwave Circuit design by Linear and Nonlinear Techniques"
or the one what you can find..
Good Luck