Do i need to make on appoiment to get the transmisión oil change??

Yes ... appointment needed

Yes

Whaaaat? What should the mileage recommendation be?

I would drive to Ellensburg and get it done you will be much happier in the long run.

Ues that would be recommend.

Be aware, from past experience, they'll sell you a Transmisson service in half the mileage of the manufacture recommendation.