How do i make a picket fence for a cake?

so im new to this whole cake decorating thing im a chef but trying to teach myslef something else...for my girls first birthday i plan on making a cake with a winnie the pooh in the garden theme..my idea is to cover the cake with fondant have the toppers on the top with a picket fence going around the side of the cake with flowers placed around and gr piped at the bottem of the fence howver i am stuck with the fence idea..i would like to use fondant what would be the best way to do this...should i cut the fence in sections and let it dry before putting it on...also how do i make it stick well...any suggestions would be gratly appreciated...thank you in advance