Well asuming you allready have php up and running someware,
go to www.php.net and get a copy of the official documentation, its really easy to follow (in comparison to most official docs) and should be able to answer may of your questions
Also search these forums for specific areas of interest, somebody has usually had the same problem, if not post a question.
Search for articels and tutorials, there are loads out there jsut use your favorate search engine and do a search for PHP +tutorial and you should find plenty of info.
This is how i learnt the basics, and never had a problem finding out how to overcome particular problems
Hope this is of help