Well, good luck!
I’ve messed around with this a little bit, it’s good fun so i guess maybe go with that in mind rather than relying on a catch for dinner, cos its quite hard, compared to spinning for mackeral.
B.A.S.S is a good place to go for tips on catching them in general (ukbass.com).
I would say, as a rule match whatever fly you choose to the weight of your rod and line weight (you won’t chuck a big heavy fly a long way with a soft flexy rod). Silver coloured small fish replica flys work well for most species, including Bass, but clever guys use things like crab or prawn flys, which are a bit specialist.
My tips would be: Dont bother if its windy, especially onshore wind; Dont forget eye protection/ sunglasses for fly fishing (seriously, google the photos….); and look for ‘rough ground’ to fish over – Bass hunt in rockpools, especially on an incoming tide. You cant cast anything like as far as normal sea fishing, so dont try – fish in shallow water over rocks, as this is the best trick of fly fishing (you dont get snagged as much on weed/ rocks as other styles of fishing). Big bass will hunt in shallow water, less than a metre deep looking for crabs, prawns, small fish etc so thats your best shot.
Hope you get some dinner – there is a minimum size for taking bass, to ensure they have had a chance to breed (40 cms i think) so maybe watch out for that if you get a tiddler!