I have a few PCs that I would like to put on a small isolated network, load up some sample smart contracts, and get them talking to each other. Any advice on what sample Ethereum code to begin with?
Welcome to the community 
Do you want to setup an environment for automated analysis or more general experimentation?
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Andrew,
I believe I want to go for an automated analysis, as I would like to develop code that others will adopt. For now though, I just need to get something running that I can play with on my machine that will interact with other code on other machines.
Thanks,
Bradley
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You could start with running a local blockchain ganache-cli on one machine:
https://docs.openzeppelin.com/learn/deploying-and-interacting#local-blockchain
You could also use public test networks:
https://docs.openzeppelin.com/learn/connecting-to-public-test-networks
You could also create your own network, in the past I have used Microsoft Azure to spin up a Proof of Authority network.
Though it depends on what you are trying to do. To experiment with contracts, I would use ganache-cli and public test networks.
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Feel free to ask all the questions that you need.
If you are new to smart contracts, the Learn guides are a great place to start: https://docs.openzeppelin.com/learn/
It would be great if you get an opportunity to Introduce yourself here!