New to mountaineering

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I moved to Ecuador a few months ago and found out about all the great mountains here to climb. So as a motivator to exercise, I am starting to train so I can climb some of the mountains here. Just walking right not, but will start Couch to 10K next month and also climbing stairs on my non running days. I live at an altitude of 8,300 ft here in the Andes. Would love to climb Chimborazo since it is the highest mountain (if you measure from the center of the earth). Elevation of 20,700 above sea level.

Any pointers would be appreciated.