Welcome to the site Chris, if your wanting to try bangor pier the best place for starters would be of the fishing platform, close in you'll get wrasse,pouting,pollack and coalies on float fished worm baits( you can get the float kits in trap and tackle ,get some float stops as well) and whatever you do don't be tempted to feed the seal or he'll hang around all day
you'll also get mackeral inside the harbour entrance on feathers.
If your tempted to try the back of the pier be very careful of the hss wake, you'll know its close when the water starts sucking back out through/over the rocks, if this happens get to high ground quick