Ken and Scott are correct and you can see this in the pics posted.

As far as a beginner learning washes from the start, YES. A wash is the basic in weathering. Before all the chipping, streaking and filter techniques the basics were washes and drybrushing. Both these two basic skills/techniques are and can still be used. Not so much the drybrushing by many but washes are very important.

I normally do my filters first for depth, then add only pin washes. I will sometimes go back and add a fliter to some parts of the model. The filters work great for creating highlights and shadow effects, similar to the CM technique.

As Ken has said, filters take lots of practice. Besides oils and enamels for filters I also use acrylics for some fliters, again for effects.

Rob