advise u to buy a nice one, it can not look nice. but the quality must be good, can see things clear u better take a book with u. if this camera can see the small words in the book, then it is nice

Yes, go for the quality (resoultion) of the image. I also happily used Logitech for years - though my last webcam purchase was from Ebay and that also works fine. Some also have a built-in microphone; that's really your choice - perhaps the microphone you (might) already have is better quality.

A good brand for a web cam would be Logitech I have one and it works very well and is inexpensive.