Installing or working with wear os by google on keil/arm products

I want to make a wearable smartwatch which works on keil mcbstm32f400 running android wear/wear os ,i want to know the procedure how to install wear os on the dev board.I did some research and i got to know that that only some devices have wear os like qualcomm's wear 3100 and ti omap but they are not available for purchase so i also got to know about other os like tizen which can also be used for wearables but i am stuck at which one to choose ,how to start , how to install on the board.Please guide how to proceed.

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