plaster casting

for this assignment, i am having trouble understanding how to put together the things that i make into a coherent piece. i put a bunch of things into the clay and made it into a plaster piece but i dont think it is really working. there is no connection between any of it. i used a rector set piece and made paw prints and a random tool thing. i want to incorporate more of a meaning into this assignment but i dont know how to accomplish that. i havent had any experience using plaster or clay for that matter and i'm just trying ti get used to working with it. because of this i am just experimenting with it and trying to become mor comfortable with it.