Thanks. For baggage, it says "2 items max. 23 kg", which would be perfect for me.
For seat, can I just skip it altogether, as it says "Free from 24 hrs before flight."? I mean currently it says 30 EUR or similar, but there isn't really any point in buying it, right?

Can you tell me about Plata status? I've just registered for IberiaPlus so my account is currently empty. Does it make any sense to buy credits now, or your advice is mostly about taking the flight now and getting Plata status in the future, which I can use for benefits later on.