got a reasonable camera, a gf1, and just wondering what add ons are sensible to get to get the most from it.

first decide what you want to do, then get the thing that allows it…

but, as i am experimenting and finding out what i can do, knowing what i want to do is not as easy as it first seems. hence the vagueness of the question, i guess i am more interested in the environment than i am in people and animals. if that helps narrow it down at all.

Probably just a plain Skylight or UV filter to protect the front lens glass. A circular polarising filter is a nice addition if you're taking shots outdoors.

Circular Polariser and ND grads are useful for landscapes – ND filters and a tripod for blurry water shots etc