sorry, you can’t just ask for a whole analysis.
You saw the tutorials for pre-processing which show you how to deal with S1 GRDH data.
Then have a look at some studies to get an idea of what different approaches in agriculture exist.
Search in this forum, there are lots of great examples:
Radar remote sensing isn’t something you can master over night and just apply by following a recipe. Read some stuff, develop ideas, discuss problems in here - you are free to make your own mind. Especially yield estimation is ambituous and you would need to have reference data from the field (or statistics on your crops).
Here are some great documents / tutorials if you are new to SAR remote sensing:
Introduction to SAR remote sensing
A tutorial on synthetic aperture radar
Forest Monitoring with multi-temporal SAR data
Agricultural Applications with SAR Data
Guidelines for SAR interferometry
If you have problems at specific steps of processing - feel free to ask! But you can’t expect others to do your science.