Hi Julia,
Sounds like you are doing your home work and have looked into the legalities, good on ya.
As a fisherman i would strongly recommend having a go if you fancy the idea of fishing, if you plan on using caught fish to supplement your diet though i would bring plenty of food "just in case"
I've been fishing most of my life and i still go long times without a catch, this with the local knowledge, experience and the best kit money can buy.
It's not unusual for me to have 4 or 5 rods and line in the water at any 1 time, some of those will be large beach casters with the ability to cast 150 to 200 yards.
I'll have various baits, from various live or dead baits to spinners, spoons, scent-enhanced plastic/rubber jigglers, kg's of groundbait/chum.
Still i can go a few trips without catching anything.
Thankfully it's not as overfished over there in the UK as it is here in Greece, but still i know experienced anglers that wouldn't rely on their daily meal from whatever they pull from the sea.
If you have very little experience fishing it's going to make it even more difficult.
What fish are you targeting
When is the best time to fish for your target fish
What's the best bait in that area at that time of the year
What sort of water depths are they eating
What tides are best
Some fish are a bit choosy about what time the eat, you could dangle a fish equivalent of a Gordon Ramsey 3 course meal and they'll not bite at certain times of the day.
You could get lucky, the kids pulled out 3 Gilthead seabream the last trip, that's 3 EACH, i didn't even get a bite
, so sometimes lucks just on your side.
My point is, by all means take some fishing kit along if it's the act of fishing you plan to enjoy.
If your fishing purely for food though in all honesty i'd take some boil in the bag packets of food instead, as it'll take a LOT of time a LOT of patience and a LOT of luck to consistently catch enough for a days meal.
Even then some fish really do not make good eating, in some costal areas dog fish are extremely common and as they eat pretty much anything they're a common catch, sounds great but as they urinate through their skin it's better to take a few precautions when preparing them for the table, so you then have to add a knowledge of local fish to the list as well.
Don't want to put you off as fishing is a great way to pass some time, and the tastiest fish are the ones you've caught, prepared and cooked.
I just don't want you to have unrealistic expectations.
Cheers
Mark