I bought the bass I was asking about last weekend, and have been playing it for the last week. It's an old German ply that the seller thought was from the 50s. It came with a bag and a bow, and seems to have a decent setup and newish strings, as he had claimed. Fingerstyle (or pizzicato as I think I'm supposed to call it here) hasn't been too hard to practice, though I am no doubt missing many nuances, from precise intonation to plucking technique. Arco has been harder to pick up. An initial internet search for teachers around here was not very promising, but word of mouth might have better results--I know there are double bass players around here.
Anyway, I'm enjoying myself so far.
Anyway, I'm enjoying myself so far.