How to start a model

Hey, I’m new to Blender but I know some basics such as extrude, grab, rotate, scale and a bit of the sculpting tools. I also know about modifiers but I’m having trouble starting a model. I don’t know what shape to start with or how to get it into the basic shape I want to sculpt into whatever I’m making. Are there any tips or tricks about how to start off a model? or tutorials that anyone knows of? Thanks!

model off your reference image

what kind of model you are gonna model like character, environment (grass, plants, rocks & mountain). Please specify any one so that we can easily guide you