Choose a container that will complement the shape and color scheme you have in mind. If you are just starting out, go with a traditional size vase __ not too tall, and not to squat. As a general rule, your container should be about one_third to one_half the size of your finished arrangement. So, for a vased bouquet you'll need mostly flowers with longer stems. A smaller bowl or basket is fine, too. You'll simply have to cut stems shorter and may need floral foam to help position each bloom. It helps to start with the simpler designs and work your way up, and a vased bouquet is often recommended for a first project.
Place your ornamental cut flowers into your water vase, make sure that you put it one by one. If it's going to be a design or floral arrangement against a wall or flat surface you have to put the tallest or longest cut flowers at the back. If your design or flower arrangement will be visible from the sides place your longest or tallest flowers in the middle. Begin with the longest or the tallest, and then go out to the lips or edge of your flower container. Now, take time to look at your flower vase, is it beautiful and pleasing to see? Did it turn out to be symmetrical? Is there a spot or an area that needed to be filled in with more flowers?