First things first

So, one of the first things that some one asks when learning a new programming language is perhaps, "What should I already know before I start?".

Something that you should already know before starting is C.

Other thing that it would be useful is to have some knowledge about object oriented programming.

The language that we will use is called "Objective-C", it is a language that is derived from C but if you look at programs written on Objective-C you will find very little resemblances with C.

Maybe the second question you will ask is "What tools do I need?".

If you are learning to program for Mac OSX you probably already have all the tools you need.

You will need a Mac (obviously) and and IDE (Integrated Development Environment) called Xcode.

I'm not sure if the Xcode already comes installed when you buy a Mac but it is available on the installation DVD although I recommend that you download the latest version from the Apple website. (You will have to register as a developer)

At the time I'm writing this post the latest version is 3.2.5 but there are already announcements for the upcoming version 4, from what I've read, this version brings major improvements compared with the current version.