Birds are extremely diverse and different, and the variety that is present in them is amazing. Every species of bird either distributes seeds and is a source of food for other animals, or they clean up after other animals. Then there are the majestic birds of prey that do their job in keeping everything in balance.
One important rule among these is that you should not disturb the birds that you are observing. Never play with a nest that has eggs or chicks in it, because it is very likely that the parents will abandon their chicks or eggs when they realize that the nest has been tampered with. Respect the birds and their space.
Get yourself something that is of a good quality and a brand name, because if you don't, the whole thing will lose its purpose when you see a bird in the distance that looks great, but you cannot identify it because all you can see through your cheap binoculars is a ball of puff. Thus, spending some extra money on a pair of good binoculars is always better.