The first private knowledge system an SMB should build is not a company-wide brain. It is a maintained answer system for one operational area where people keep asking the same questions.
Good candidates are service policies, quoting rules, onboarding steps, internal procedures, product notes, renewal terms, or field instructions. The common thread is that the knowledge already exists, but people lose time finding it or asking the same expert again.
Use approved sources only
The first version should start with a small set of approved sources. That might be a folder of PDFs, a handbook, a pricing rules document, or a set of internal notes that someone owns.
Do not connect every source on day one. More sources make the demo look better and the maintenance problem worse.
Show the evidence
Private knowledge systems earn trust when users can see what the system relied on. Every answer should point back to the source material, especially when the answer affects a customer, a quote, a contract, or an internal decision.
If the system cannot show its evidence, it should not be treated as operational.
Assign maintenance
The system needs an owner. Someone has to know which documents are approved, when they change, and how to remove stale material. Without that ownership, the system slowly becomes another place where outdated knowledge hides.
The first private knowledge system should be narrow, visible, and maintained. That is what makes it useful past the first week.