APEX

Hi Oracle Experts,

I'm newbie to Oracle at all. I'm not sure if I post to the right forum.
I know mssql and visual .net, also know a bit about RDBMS, event driven, client server, third tier applications.

I used to build web application using PHP and MySQL and client server with Visual .net or Delphi.
I try to learn Oracle programming in order to able to build some application.

I have Oracle XE installed on vmware and Oracle Developer Suite 10g installed on my desktop (with all modules in version 9.0xx).
I ready all XE quick start, installation guide, some other tutorial from prenhall, oracle designer tutorial, etc.
I'm not sure if I do the right thing now.

I still nowhere in:
- how to build an simple client server application and/or third tier application.
- what kind of IDE should I use?
- what kind of programming language I should use?
- any debug tools
- how to deploy application I created.
- where to start? and how to start?

May be because I used to stick with Visual .net and mssql, so I confused with Oracle concept.

Now I try to build application without involved any kind of M$.

Please help and advice me. Thank you.