Running the REST server is simple because it comes packaged into the Microtick mtcli binary. In a separate terminal window from your running node in the previous step, set your MTROOT environment variable to point to the directory where you're running the testnet (you created this directory in the previous step)
Leave the REST server running because it is used by the Microtick API to marshal / unmarshal transactions (until Cosmos Stargate).
Questions? The Microtick Telegram chat link is: https://t.me/microtick_general