You will need wire cutters too. Being the daughter of an Engineer, i highly advise buying top quality tools (Tungsten / carbon) rather than cheaper 'hobby tools' - you won't replace a pair of these beauties as long as you live (sort of)
Then the basic method is to stack your buttons!
Get masses and masses of buttons in many different sizes so you have plenty of choice. The key to any stacking of any size stems / bouquet, is to have at least 3 different sizes. I also find it best to mix up the plains and patterns. LEFT = Bigger size. RIGHT = Smaller size.
The gauge (thickness) of wire will depend on the hole sizes of your buttons....
I make my tall stems 10 inches long...
NEWSFLASH: this means you will need a length of wire 20 inches long. you will be foldong the whole piece in half! it is easy to forget that point. So cut 20 inch and fold over in half.
Thread the buttons right up to the top - small medium large
And then, twisty twisty twisty the 2 halves together (sometimes making your hands sore after 20 or so stems....) all the way to the bottom. You can always trim excess off with your QUALITY tungsten cutters.
And it is that simple. But they look best in bunches of 5 or more.... the more the merrier!
You cab put 4 buttons on? and experiment with different feature buttons on the top.
Try and add ribbon tags and stems and leaves...???
experimentation is the best way to get a unique and wacky fun bouquet!