A Telrad, a good adjustable height chair and a set of charts (or planisphere) are the best accessories that I can think of for lots of enjoyable night viewing with my Dobsonian mounted reflectors.
Welcome to the club!
With respect to dew prevention you can be low tech or high tech...low tech can be as simply as a foam "can cosy" for the Telrad (which I did for a long time) and then I went high tech and got a heater...both work fine.
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