Centerpieces included

The centerpieces are included in the reception package and I was wondering if anyone had information regarding creating the floral arrangement.
Do I have to contact the hall, the florist they use?
I want to call my place and ask but I don't want them to think I'm an idiot...

my centerpieces were also included and I had to contact the florist directly.
And don't be afraid to ask questions, You won't sound like an idiot! I'm sure they heard it all before.