on auctions you have to look at the birds fast. look for swollen eyes and wattles, check the legs for mites. if you can handle the bird look for mucus under the wings and around its vent for gleet and/or mites. auctions scare me the most because its hard to look the stock over a lot of times. every bird in that auction is there for a reason. there are a few people who raise them just to sell at auctions, hoping to make a little. then you have the guy who has some sick birds and no place to quarantine them. then you have the ones that are hens that are to old to lay, and unfertile roosters.
the basics of attending an auction are, you sign in and get your number. the auctioneer will announce what exactly is for sale. it can be single birds, pairs, trios and pens, some are cage included some aren't. he will also announce if the auction is per bird, or for the group. for the group (sometimes called "one money") the price he is saying is the price he is trying to get. and what you bid is what you pay.
if the auction is per bird, you multiply the number of birds by the bid. for instance if your bidding on 4 birds, and the bid is for $5 the price you will pay is $20. depending on breeds and where the auction is, ive seen sickly looking birds go for $1 and healthy rare breeds bring $50 and more.
if your selling birds at an auction, there is an auctioneer's fee. its a percentage of the total sale price, normally around 20%. so if you sell a bird for $10, the auctioneer's fee is $2. your cut of it is $8.
if you have any questions now is the time to ask. LOL