Hi Thiago,
I hope I correctly understand the question. While we make the software, we do not offer installing and configuring the software. For that you would either need to hire a system administrator or do it yourself. We do, however, offer
support subscriptions - that is, if you have proxmox installed and something breaks, we will try to help you fix it.
What will hiring a system administrator cost? That depends very much on your infastructure (so, how many servers you are running and what is on them), which country you are in, what experiences your administrator has, etc. I can give you no estimation what that would cost, since I don't know the answer. Sorry.
What would you need to know to do it yourself? That depends on how much you know about linux and computers in general. If you are a little familiar with linux, there are good resources to learn how to use proxmox. For example
the documentation or Youtube.
I hope this answers your question
