my advice for getting started- take good notes on the betting patterns of people you compete against on a regular basis. eventually a pattern will emerge.
Also, one other piece of advice for people trying to pick up tells
- don't force someone into a box when you don't have enough information, i.e. don't automatically label someone a donkey or a nit after you've seen them play 3 hands. You have to be able to put their behavior in a context.
how you use that information, is another story...