Hi Paul, welcome to the Flow Forum.
The best place to source a new colony of bees is with your local beekeepers, clubs or associations. You may be able to connect with a local beekeeper near you, here on the Flow Forum, that might be able to help you out.
Here’s a helpful page with options for sourcing bees.
Please feel free to ask the forum community for any specific questions and I recommend browsing other threads to get you started 
such as Beekeeping Basics.