Ireland drives on the left — and an International Driving Permit (IDP) is recommended.
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Ireland drives on the left-hand side of the road.
Not strictly, but it's recommended. Ireland doesn't require an IDP for short-term US visitors, but it's recommended, particularly as backup ID for rental car companies.
In the US, an IDP is issued by AAA or the National Auto Club — it costs around $20, requires a passport photo, and can't be obtained after you've already left the country.
No — an IDP is a translation document, not a standalone license. You must carry your regular US driver's license alongside it at all times.