Any must-have accessories for a first scoper?

[Schorhr]

Do that :-) Also as the eyepiece's shipping costs are moderate, you could get the one you'd like most and make sure it's quality and the wide angle properties are to your liking - and then either order another one, a 58deg planetary one (Seen that in my link the vendor offers them too) or go with some cheaper one's if you don't mind the smaller afov.

Sure, the planetaries afov is smaller too, but they are available in a larger variety of small focal lengths and perform pretty good on newtons below f/6 (while erfle designs will have some issues with being sharp over the entire field... just a thing to keep in mind if you ever upgrade to a larger newton)