Hi,
it seems you are a little confused 
If you want to create a flash file that loads data dynamically through a provider (mysql in your case) then you first need to create that file ideally using xml files. Then, you will create the database you need (consider all the data you need to include) and the php scripts to export these data (given the correct sql querys) to xml files that your flash app will understand.
Its not very hard, i just recently did so to create a video gallery (similar to youtube but with a smaller audience in mind) and a blog of sorts. You can find infinite tutorials on using php & mysql. Start from there, make the php scripts you need to insert & return database items and then all you need to do is export them to xml files.
What you describe is very vague, so i cant exactly show you a tutorial. If you do not know how to program yourself, hire a coder. You can use most of the xml driven files on flashden in this way for sure. If you are interested in making such a thing and you need a professional, i am interested & i have experience in both flash & backend programming.
In any case, you can find hundreds of tutorials on most of these things
