[HelgeSeetzen]

Ask a decent local law firm for a standard partnership or shareholders agreement. Then ask them to handle the incorporation. Neither activity is very expensive (<$1k in both cases usually).

You need to do the incorporation steps anyhow and "internet templates" are never really the best idea for local activities like this (your state/country might have different rules, your personal situation might have different tax implications, etc.)

PS: I am not a lawyer nor usually an advocate of massive lawyer spending. But this is such a key document that messing it up will cause you nothing but pain.