To clean your desired container simple soap and warm water can work on a ceramic piece like this thrift store found coffee pot ($5). If you're going for a more classic look of silver, bring back its shine with toothpaste (paste, not gel). Rub on with a damp towel, afterwards, run under warm water and towel dry.
Add water with packet of nutrients (usually comes with your arrangement), if not, you can use an aspirin, a splash of ginger ale, or a splash of bleach (helps hold back nasty water). Lay out your bunch on your workspace (kitchen counter works great), remove guard petals (first 2 or 3 pedals outside bloom), trim back stem for fresh cut (at an angle), and remove leaves closest to the end (to avoid algae in the water).