>>391347dont know much about freshwater but for sea wales is pretty good for fishing, i'd recommend starting on pollock as they are numerous and fun, if not very tasty imho. have a watch of that
https://www.youtube.com/watch?v=ZDC-LObJe98 and google around about pollock fishing to get started on tackle, nothing complicated needed but a little understanding to get the best out of it. basically you need a medium to heavy lure spinning rod, say 20-60 gram casting weight (which is the weight range it's designed to cast) size 4000 fixed spool reel, 30-50lb braided main line, 20-40lb fluorocarbon or monofilament shock leader, and traces about 20-30lb fluoro/mono - the nearer the lure the lighter the line should be so if you snag and snap it, you'll lose the minimum of tackle rather than half your main line, a general rule of thumb is to have 10lb+10lb for every oz of weight you intend to cast. so 2oz of weight needs 30lb ideally, but you can get away with 20lb if you dont take huge powerful casts. then you will want round swivels, snap swivels, small beads and weights within your rods casting range to make rigs (the arangement which your lure is tied to).
finding where to fish is probably the most challenging, for pollock you want to have deep, kelpy water which you'll find off rocky coasts. you can google around for good marks (a term for a fishing spot), but sometimes it's better to find your own, a lot of people wont tell you their favourites because if it gets well known people can fish them out or all the fish get wise to lures etc, so if you get a good spot bear that in mind. but anyway for that i have a look on
http://webapp.navionics.com/?lang=en for depths, ideally places like picrelated is what you want to be fishing from, where you get a pretty steep drop off quick and deep water close in to the shore. most places will have pollock around, just often not within an easy cast. it's worth checking tides also
http://www.tides4fishing.com/uk/wales.