Disclaimer: I do not consider myself a 'good' landscape photographer, however I think that the least bad work that I have done is all B&W landscape. I shoot mostly in 4x5, but have shot small formats as well. A few of my thoughts:
First thing that I do when looking for an image is to look for strong/interesting lines, those might be in the clouds, hills, water, or whatever. The next thing is to think about how to accentuate what I feel is interesting - for example, if it is an interesting cloud formation, would a red filter help to bump up the contrast to make it more interesting?
I am also a sucker for contrasting textures in an image - what can I do to accentuate the texture of the snow, or the clouds, or the rocks? How about making the water look smoother? - can I do both at the same time?
Although I am not a zone system practicioner, I will set my exposure based on what I feel is the most important part of the image - if it is a neutral colored rock, I might just meter the rock, if it is texture in the snow, then I will meter the snow, and adjust the exposure depending on how light/dark I want the snow to be in my final print. I will often meter the snow, and adjust by 2 stops.
Think B&W contrast. There are few things more dramatic than the red rocks of the southwest US against a deep blue sky at sunrise. Great for colour transparancy film. When you shoot in B&W, you will get grey sky with grey rocks for a flat image - filter to bump up the contrast so that the impression left by the B&W image is the impression that is left by the real image.
Film is cheap, time is expensive. If I can't decide on how to do something, I will do it multiple ways - shoot with different exposures, or filters, or multiple exposures which are the same, with the intention of processing differently.
I am a nut about recording data. I have preprinted 3x5 cards which I use to record every exposure - it has all of the information on what I was thinking at the time the shutter was released. These cards are kept with the negatives and with a copy of the print - augmented with information about how I print the image. Valuable to go back and figure out how I could have done something differently if I have an image that is almost good
and finally - how did I get to where I am now? - by wasting a lot of film. I am always horrified by the number of film boxes that we have hanging around the house!, With all those empty boxes, there must be some good images somewhere........