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Where to start?
This depends on where you want to end.
For us to provide meaningful guidance and advice, we need to have some idea where you want to go with this material. In other words where are you along the scale of keeping versus selling ....
Do you intend to keep it all?
Do you intend to keep and develop select portions?
Do you intend to sell it all?
So far, your images show an "accumulation" by a previous owner rather than a "collection", which typically would show more organization.
Philately can be a rewarding and educational hobby. It can also be frustrating if it becomes just a search for treasure.