Some really good read me's here:
http://www.thesitewizard.com/php/index.shtml
If you are used to looking at code like java & html sometimes its a good idea to upload some free scripts to your site, and mess about with the code / html content as it will give you some practical views on how things work. I would also always recommend keeping copies of the original files incase you fatally break the script and so you can re-upload and try again.
Couple of Coding 'Rules' (loosely) That will make learning easier::
1: K,I,S,S - "Keep It Simple Stupid"... my college professor taught me that one, not calling you stupid of course but if things are too complex it can be a headache so keep things simple is always a good idea.
2: Fully Comment your code! in php you can do a // and add some text to remind you later whats doing what. Each lang has is own version and its always advised especially if its something new you are trying to figure out.
3: And remember copy & paste is a programmers best friend if you write something that works, don't be afraid to reuse it else where with changes as needed.