Hi finlayson87, and welcome
I'm not even in the UK any more, so it's a few years since I fished for pike or even chipped in to the coarse forum here. And I was never a very experienced pike angler, but maybe that's a good reason why I might be able to offer advice? I was pretty much a novice too
Hooking your first pike on something like half a mackerel is like no other coarse fishing experience you'll ever have. Truth be told, there's only one thing that's really likely to be on the end of the line ..... and if you've read about pike, deep-hooking, teeth, gill-rakers, resting a hooked but tired fish, nursing a fish before release, forceps and wire cutters, suitable landing nets etc etc, you'll realise that getting the fish back in a healthy state is no gimme. What are you going to do if a loose barbed treble gets terminally snagged up in your (woven) carp landing net while a pike is attched to the other hook? Chew through it?
You might have covered all this beforehand, but have you actually done that research? The fact that you're starting on a weedy water and even mentioning bite alarms makes me worried. Was that a line bite, or a pike with your bait already half way down its neck? With a float you might well spot this, with a carp style bite alarm setup you might not ....
This might sound like a put-down. It isn't, it's well meant. If you don't take the right (even theoretical) knowledge, and equipment, you might find your first piking experience very unpleasant. Make plans and it could be the thrill of an angling lifetime
Now - if you started out luring on a relatively simple water you'd be much less likely to run into problems
Sorry if this sounds like a rant, but the pike gurus here used to step in pdq. Where are they all?
All the best !