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I don't like preventing users from creating Accounts and Contacts since you are trying to get them to use SF, and preventing them from creating records weakens that effort.
Instead, take a look at Duplicate Management. You can define rules on Accounts, Contacts, Leads, for example, that either prevent users from creating a record if it 'matches' an existing record, or prompts the user to either use the existing record, or continue to create a new one.
