The official language is Irish Gaelic and spoken in most areas as the first language. English is the other official language spoken.
Greenwich Mean Time
In Ireland it'll cost you about €5 (approx $5.69) for a pint of beer... get that Guinness down you! It's the native land, after all.
If you're looking for a cheap meal in a pub, you're expected to pay between €8-€15 (approx $9-$17), or if you're feelish flush go for a 3-course meal, which is around €70 (approx $80).
Catching a taxi on a basic tariff will start at €4 (approx $4.55) and add about a euro per km. In the cities, hop on the local transport for about €2.50.
A one-way ticket on public transport in the cities starts at about €2.50 (approx $2.84). Alternatively, just hit the road in a rented car or campervan & see some of the countryside!
A hostel bed in Ireland is the cheapest way to go, and can cost between €12-€20 (approx $14-$23) per night.
If you're looking for a little more than a dorm room, a double room in a hotel or B&B can cost between €80-€180 (approx $91-$205) depending on where you're staying.
You can visit Ireland at any time of year, but if you want to avoid the cold winter months, that might be better - so you can fully appreciate the countryside walks and coastline. Peak tourist season, unsurprisingly, is July and August, so try to go either side of those months. June or September would be the best months - however, if you want to check out the art scene, October hosts a lot of art festivals across Ireland.