Tutorials covring PHP and FLASH together exist, but none of them are focused on a particular db.
My suggestion is get comfortable with PHP and MySQL and then read the tutorials on PHP and FLASH.
Unfortunately, there are more tutorials on FLASH with ASP then PHP, but if you're confident in your PHP skills, even these can be helpful.
If you want to create FLASH with PHP, this site (phpbuilder) has more info than any other. If you want to use FLASH to communicate with PHP, check out http://www.actionscripts.org, http://www.udzone.com and it's sister, http://www.FLzone.com. Macromedia has a few tutorials on how to use Flash forms to talk to server side scripts, so check there as well.
There's a lot of gotchas out there, I'm hoping to do some writting myself, but it won't be until the end of the month.
Matt