This is a good workable exposure.
What style are you hoping for?
If your title is any indication, perhaps you want an old west style that is more nostalgic. For this, sepia tone is the obvious choice...perhaps too obvious. Here are the things I would do:
* Add vignette
* convert to a light sepia black and white
* On that B&W layer, mess around with the blend mode of the layer and the transparency until you find a mix you like...I generally look for somthing that is desaturated and toned, but with a bit of color showing through.
* Make a duplicate layer of the image and render fiber, set blend mode to soft light and decrease transparency until you like it. In my sample I also masked the sky from the fiber render because I didn't like the strong lines in the smooth sky.