The one that looks like a witches hat is a flower nail for roses, without using a base.  Make the rose with royal icing, let it dry and remove from nail.  The "half ball"  is a flower nail used to make royal Icing peonies, without an icing base.

Is the wooden thing for pressing pastry into individual moulds?

Hi Bellymana,

The one on the left is what we used to make a royal icing basket or decoration for the cake. The middle was for a royal icing decoration also flowers such as roses or grapes or flowers that cluster together. The last is used to make a royal icing flower or a raised decoration on a cake. I have use it to make a lattice work royal icing side decoation. I am not sure what the wooden item is.

You use them the same way you would for molding a tiara.  If you can find the original WIlton Cake Decorating books, there are 4 hardcovered book, you will see pictures in there of how to use them.  They are great little tools. Have fun using them!