Think HF summed most of it up. I’ve got a pair of Pacenti SL25 rims on my Audax bike. I think they’re 20mm internal (between the hooks) so tape between 23 and 25mm will be fine. I’m using this -
https://www.vikingtapes.co.uk/collections/3m-polyester-tapes-flash-tapes/products/3m-8992-polyester-tape-50mm-x-66m?variant=32868785520703 in 24mm wide at the moment. You need to select the right width to avoid the eye watering price! I prefer it to the Tesa, but both work fine. The Tesa does have better initial stick, which probably makes it easier. In both cases keep the tape tight when wrapping your wheel and probably do two layers.
Tyres - Hutchinson Fusion 5 11Storm All Season sound like your sort of thing and should go up with a track pump on SL25s. There are also lighter Performance and very light Galaktic versions. If you want a bit wider then WTB Exposure come up between 30 and 32mm wide on SL25s and ride nicely, but they are a bit harder to set up than the Hutchinson and mine went flat overnight a few times before settling down. Continue GP5000 are also good, but they are usually still expensive.
Buy a few spare presta valve cores and you’ll likely get given a couple of keys.
Orange Seal Endurance is probably still too dog. I’m currently using Oko High Fibre, but haven’t anything to say about it yet. Buy a litre so you can top up. Some sort of injector so you can fill/top up through the valve stem - I’ve got a Stans version, plus a couple of big syringes from other uses.
Don’t let the sealant dry out - it’s easy enough to check by taking out the valve core and poking a small Allen key down into the pool like a dipstick. If you do let it dry out and then go for a ride that includes a descent of Greenhow Hill it can be a tad unnerving.
If you’re near Harrogate I’ll happily tape your rims for you and help you get set up, or ask here of course.
Mike