Server for Quickbooks and Quickbooks POS

I'm not sure if this is the correct place to ask this, but I couldn't find a section for servers for a small businesses.

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What I'm looking to do is to set up a server for my retail business in order to have a central place to store all my documents/invoices/etc in addition to sharing inventory data between Quickbooks and our Quickbooks POS system across multiple computers.

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We are also looking to secure a warehouse in the future too and that would also need access to the information above.

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What would be the best solution for my use case? I'm fairly tech savvy but when it comes to server and networking, I'm as good as a blind man. Any resources or advice would be appreciated.

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Thanks