What components do I need to get?

Im getting totally confused with all these different packages.
I want to create a flex app that connects to mysql.  I downloaded and installed the flex 3 plugin, tomcat, and the tomcat plugin.
So now I can create a simple little app and show it from the server.
But when I create a new flex project, it asks for server technology, which I guess is J2EE.  What is the remote object access service?  And lifecycle data services?
Because if I select that I need to then select a flex war file, which I have no idea about.  Where is it?  Do I need to get it?
And what about BlazeDS?  Do I need that?
Or the lifecycle data service package?  Is that part of the flex plugin I installed (since I can select it with new flex project)?  And that install packages comes with its OWN tomcat.  I like to have tomcat run via eclipse...
What do I need to be using here, and what do I not need to worry about?

LCDS stands for LiveCycle Data Services:
http://www.adobe.com/products/livecycle/dataservices/
http://www.adobe.com/products/livecycle/dataservices/indepth.html
In a nutshell, LCDS allows realtime data push/pull - keeping applications synchronized.
BlazeDS is the open source variant:
http://opensource.adobe.com/wiki/display/blazeds/BlazeDS/
How to set up a BlazeDS project:
http://learn.adobe.com/wiki/display/Flex/Creating+Flex+Builder+Projects+that+Use+Server+Te chnologies
If you want a Flex application to "talk" to your server (e.g. to load data from MySQL) you can use Flex Remoting, which is a binary messaging format (AMF3). To do so, you'll need "something" on your server that understands that format, LCDS/BlazeDS is that "something".
Remoting comes in different flavors:
PHP - AMFPHP, ZendAMF
ColdFusion - built in
J2EE - BlazeDS, LCDS
etc..
In Flex you use <mx:RemoteObject /> for Flex Remoting:
http://livedocs.adobe.com/flex/3/langref/mx/rpc/remoting/mxml/package-detail.html
Mind you, Remoting is not the only way to communicate with a server.
You can send and load data (GET/POST) using <mx:HTTPService /> and use soap services with <mx:WebService />
http://livedocs.adobe.com/flex/3/langref/mx/rpc/http/mxml/HTTPService.html
http://livedocs.adobe.com/flex/3/langref/mx/rpc/soap/mxml/package-detail.html

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