How old is she? It sounds to me like she's two???

Anyway, it's only day one. What you need to do is remain assertive, ensure she carries out the tasks and she will learn, very quickly, that you mean what you say. If she refuses to clean up toys then have her sit out at first, right there, on the playroom floor with a bucket and some toys to put in the bucket. Those are HER toys that must be picked up by HER. She sits there until it is done.

You must be firm right off the start.