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Terranaut, you stand upon the precipice of the astronomy expenditure rabbit hole, the depth of which is determined only by one's budget and (often to a much lesser extent) common sense. Scott & Richard make excellent points, and you could be good for years with these basics. You could also go for a narrowband filter of some description (OIII or UHC) to make faint nebulous DSO's a bit more visible and bring out more detail. If the GSO tube is extendable, then you may want to invest in a light shroud (although an extendable dob will often come with one included). Other than that, you really should be good to go, until such time as you've got a few observing hours under your belt, and maybe done some observing in company so you can try out other eyepieces/filters before committing. Perhaps you may also look at downloading a program onto your phone/tablet like stellarium or sky safari to learn your way around the sky and see what's what. Good luck.
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