Notary services in Oregon are available to help you with signing contracts, power of attorney, wills, affidavits, deeds, and other common legal documents. The fraud deterrence provided by a Notary helps all parties entering into a legal agreement stay protected and avoid bad outcomes.
Check with your notary ahead of time, but government issued IDs including Drivers Licenses, Passports, Military ID, Green Cards are commonly accepted. Make sure it has a photo, and remember it's at their discretion to refuse to notarize if they aren't convinced of your identity.
While some states are expanding their remote online notarization programs, these basically always require real time video communication rather than a traditional telephone. Check with your Notary to be sure, but expect that the answer will be no.
Some documents require a third party witness to the signing, but not all. Rules again vary by state, so check with your Notary on whether a witness is needed and any specific requirements. Generally speaking it will need to be someone with no interest in (not mentioned in or otherwise impacted by) the agreement outlined in the document. Friends and neighbors are a good bet.