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The MIMB is ac ready which means it should have a mutli speed blower already for up to a 3 ton ac .Let me get you a wiring diagram
You will need to run an 18/2 wire between furnace and outdoor unit and a wire from Y at thermostat.
Y wire will not need to connect to anything in furnace but most people run the wire from thermostat to furnace for a convenient junction location.
So we will have a C (Common) from furnace transformer to one side on contactor in outdoor and a Y wire fro thermostat to other side of contactor in outdoor..See drawing I made for you:
If you have further questions, please let me know.
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If thermostat does not have C, just go directly to C on board