Hi Ray
It's a bit nippy this time of year but if you fancy beach fishing then check out the website link below. You will need a decent beachcaster (12 feet) and assorted kit and
Rory's Tackle Shop in the centre of Temple Bar in the middle of town will sort you out as regards bait... they are also good for advice but not cheap... Well, nothing in Dublin is cheap any more
If you are looking for something a little warmer, you could try fishing for pike on the lakes around Blessington, there are some stocked lakes just north of Dublin in Meath with brown and rainbow trout, and the Liffey itelf has its salmon seasons start on the 1st January, and believe it or not there are a few salmon still left in it...
Have not fished around Dublin in years, but you might try the
www.ifsa.ie for sea angling clubs in the area - quite a few...
FWIW...