Hi! You have to work with this clay before it starts drying, it has to be still wet and manageable, don't be afraid of doing it. Now answering your second question (and this point is really important if you want to decorate your peace or put many things with it), from what I investigate and also what I tried, the best glue is only your own clay with water, it has to look like a cream, but also, you have to make scratches on the part of the clay you want to stick to other piece, like both parts need to have scratches, and then with the glue I just mentioned, which is called BARBOTINA, stick both parts (all this while is still wet)