Here's a good starting place:
If a domain is at auction and has bids, then it is *likely good. That doesn't mean you might not overpay for it, or that you will ever sell it. But it does mean that other people are interested in it and willing to pay something.
I wouldn't go bidding on auctions just yet. There are at least 50 pricing indicators that make a domain good. I use about 5 myself in most domain purchases that I make. Some of those are automated appraisals (don't recommend for newbies), extensions registered, age, radio test, etc. I always do research, no impulsive buys. After years of buying and selling domains you just get a feel for what is worth investing.
You can't expect to jump in to auto auctions and make money if you don't know anything about cars.