There are many things to keep in mind while you prepare to move to Ireland. Since you didn't specify where you live, I'll be comparing it to the United States.

Pros:
Culture - Ireland's small cities are steeped in history and culture stretching back hundreds of years.
Food - While the USA is known for it's fast food chains, Ireland is famous for its home cooked roasts, bacon, and cabbage.
Landscape - Ireland is well known for its beautiful and breathtaking vistas and sweeping green countryside. 

Cons:
Cost of living - Rent is on average 37% more expensive in Ireland, costing the average renter about €1,397 per month, and gasoline costs about €1.6/Liter, which is about double the price of gas in America.
Weather - Ireland is known for getting lots of rain and being overcast often.

Somethings you should definitely do after arriving in Ireland are
1. Visit a local pub for an authentic Irish pint of ale and chips
2. Visit a historic catholic cathedral
3. Purchase a bicycle to make getting around easier
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