First of all congratulations!
I would say to just enjoy your new camera as it is - it will become clear to you over time if there are any dedicated accessories you need. Build up a relationship with it so that you know it inside out, without too many other distracting bits of kit to juggle. You can even just use a towel or jiffy bag until you know what kind of case suits you and the camera, and clean the lens & viewfinder with a cotton T-shirt.
Enjoy!
