Welcome Hildebrant :-)!
The boat you got, whether it's a V.1 or a v.2, is IMO very nearly the ideal cruising boat for
learning on. I loved them half a century ago when I was an instructor. The boat is totally well-behaved and uncomplicated - unless you get carried away and complicate it unnecessarily, of course. Please DO resist doing that :-)!
You want to know "... how to run the sheets through the boom for replacement". I doubt that it's your sheets that run there :-) If you are talking about your mainsheet, then on this boat — for now till you gain more experience — I would simply run what sailors call a "luff tackle" from the end of the boom down to a tang at the centre of the fore edge of the transom locker. No fuss no muss no bother. There are reasons stemming from the boat's physical dimensions that a traveler mounted on the housetop isn't gonna serve you well.
One thing that she may not have now, but which I consider essential in ANY cruising boat is a "running" topping
lift rather than the stupid little "rat-tail" hanging on the backstay that all too many
boats are fitted with. If she doesn't have one now, prolly the best time to fir one will be when you launch in the spring.
She is not a
racing boat, so you don't really need a vang. All you need is a "kicking-strap" to prevent the boom end rising up and then knocking you on the noggin as it comes back down again. You WILL, for sure, have such "irish gybe"s until you learn to do a controlled gybe :-)
As for the electrics: Good on ye, but how much do you really need? Keep it minimal! As for the low-ampage
wiring, do not hide it behind the ceilings. let it run in tidy wire-gutters that you can get at in the future when
repairs become necessary. As they will!
Anyway: One thing at a time. Don't be shy asking :-)!
And pay attention to Ann sez in post #6!
All the best.
TrentePieds