I personally suggest it best to start by looking at the samples in the pdf files you have already downloaded. Try them and make little changes to see how they work. Ask questions on anything you don't understand, there's always someone waiting to help here (we're a very friendly and patient bunch

).
Next move onto some of the code samples on the forum and then decide on what you want your first app to do. Ask advice for the best way to start then just give it a go. Post your code and someone will show you a better way of doing it (there's always more than one way to program).
Most of all, don't struggle for too long and don't be afraid to ask. Programming should be fun and is very rewarding!
Kind regards,
RandomCoder