Yes, you and everyone you travel with will need a passport.
In the Republic of Ireland it will be Euros, however in Derry and Northern Ireland they use Great British Pounds.
In Ireland they drive on the left side of the road and most cars are standard shift, but automatic cars are available for renting as well.
Use regular taxis, Uber and Lyft aren't as widely available. See Taxi numbers below: City Cabs - 02871264466 Glassagh taxi (pronounced Glassa) - 02871361111 Foyle taxi - 02871279999 All taxi numbers are Landlines. City cabs and Glassagh have the most drivers. You may need to place a code in front of each number to dial from your USA address phones. The code is 01144 and drop the 0 from the beginning of each taxi number above, 011442871264466 would be City cabs etc