Configure QT vs build plugins manually!!!

[VireX]

He was saying, he has two screw drivers, and they both did the job good, but couldn't figure out which screw-driver is better.

[nnidza]

OK, lets forget about what I wrote ...
Just as I said my questions, thinkings wasn't clear enough because I got too many
questions in the same time and I do apologize for that.
Let me try on this way...

My absolute interests are databases and building forms to access data.
I know how to build forms, how to access data using forms, mostly I understand principles of QT C++ programming ...

But what I don't know is use of dlls, libs,.. configure such things...
So thats why I want to ask you following questions...

FIRST CASE

1. I want to configure my QT with MySQL, PostgreSQL.
I got QT installed, MySQL and PostgreSQL installed in following locations:
C:\PSQL, C:\MySQL. I set variables to point to specific directories...
I didn't make any debug libraries, so I just got a fresh install.

What are the steps that I should do?
(build debug libraries, configure manually, build plugins...)
What do you recommend?
What do I get as the result of this operations?
Which files should I use with my .exe file?


SECOND CASE

2. I got QT installed, MySQL and PostgreSQL installed in following locations:
C:\PSQL, C:\MySQL. I set variables to point to specific directories...
Suppose I clicked on the build debug libraries, so my QT works but without
MySQL and PostgreSQL support.

What are the steps that I should do?
(configure, build plugins,...)
What do I get as the result of this operations...
(dll files, libs,... what?)
Which files should I use with my .exe file?
(plugins, or some other dll files,...)



I made a couple of small application but I don't know how I made them work.
I have used configure, build plugins,... so somehow I got some files, place them into the directory where .exe is placed an they work. Not just on my computer.
And thats why I want to know what is the appropriate way to do so...
Sometimes miracle happen!