Teapot Birthday Cake

I am a tea party birthday cake for my daughter 5th birthday on Saturday. The cake will be bubblegum pink marshmallow based covering, and then I'm planning on using leftover fondant to decorate the outside of the cake with flowers and arabesques, and others. My question is, what is the best way to get the decorations fondant stick to the basis already on the cake? Should I use water? Water with sugar dissolved? Egg whites? Thank you in advance for your help!

toothpicks? "?

Use melted white chocolate or marshmallows melted - it is super glue.

I would use egg whites or royal icing.