I'm going to agree with most of the things said above, I'm just going to be obnoxious and number them. In response to "1. Flushing or listening and finding?
2. Stationary in a Hide or walking around?", I'm going to say during breeding season, flushing birds kind of sucks, and introduces further pressure that the birds don't need. Otherwise, there's really nothing wrong with any of the other techniques. Sometimes birds will come real close if you just pick a good spot and sit there and watch, which can be really rewarding. On the other hand, if you keep walking you'll probably see more variety faster, but it's often easier to see movement if you yourself are stationary. Listening and finding is great, if you're good with audio.
1. Look in your field guides, check habitats & behavior. That will give you an idea of what you might see when you go somewhere, and where to look for what birds.
2. Early morning, and evening are definitely the best times to bird. Sure you might see stuff the rest of the day, but it'll quiet down.
3. Knowing general arrival and departure dates of species in your region. Some regional field guides have this specific data, but otherwise see ebird.
4. Learning calls, hearing a bird and knowing what it is can make it much easier to track it down. You could get something like a regional Cornell collection, or the Stokes bird calls cds, which could help you learn some calls. I can't really learn that way, but whenever I hear a bird I don't know, I go outside and track it down till I can identify it visually. Also, I keep whole collections of bird songs and calls on my ipod in case it's a bird that is difficult to identify visually, as a check (for example Empidonax flycatchers).
5. Ebird! Ebird is ridiculous. Depending on how many birders are in your region, the data can be very helpful. For example,
http://ebird.org/ebird/GuideMe?step...continue.x=41&continue.y=12&continue=Continue shows for my county sightings of species in months. This will tell you when you can find species in your region. For more info, click on any species on that list and it will show you where it was sighted on a map. You'll still have to know what habitat they're found in, but it should get you close.
6. Have fun
If you found 5 species and had fun, you win. If you saw 40 species in one day but you're tired out and frustrated.... you lose.