As mentioned by Brains, the short shaft that drops into Jughole adit is good for up and down practice and communication. Another like that could be Tearsal. The climbing shaft at knotlow is great, two shortish pitches, one with a deviation, though the third pitch into Waterfall Chamber should be left for later, can be quite intimidating with the traverse and the noise! The climbing shaft into Hillocks offers a number of ‘friendly’ rebelays, and the chance for a through trip with Whalf engine shaft or as Brains mentioned, the bin entrance. Eldon or Maskill would be pretty challenging for a first trip, though Oxlow, particularly the first few pitches, is excellent practice. The deviation on the fourth pitch can be awkward.