HoW to set-up PhP MySQL development enviorment and develop in PhP MySql

I would like to develop a programm (stock and accounts) for my own business. I would like to design like - a database (MySQL) and I have to enter data and get reports through a browser on my PC. I want a fully customized application to develop and to maintain for my own purpose.
I have basic programming knowledge in C, C++, VB 6.0, Foxpro 2.6, HTML. And ready to learn new things.
Now can you please suggest me, What softwares I have to download (probably open source) and learn. Already I have installed MySQL 5.0 and now I can create a database and simple SQL queries.

Thanks in advance.

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I am happy that you have specially asked for opensource tools and yes that's exactly what you should use.
so as you say that ,you are already familiar with C++ ,HTML.
This is going to be a breeze  as all you have to do is combine object oriented programing, with Web technology.

these are the list of programs you will need:
Apache web server.
PhP.
MySQL. (as you have already installed it).
PhPMyAdmin (a GUI for MySQL database management, can make things easier).

I would suggest that you use a combined system like
EasyPhP or WAMP (for windows)
or
XAMPP for Linux

i recommend you export your SQL Database,and install one of these tools and then import it into MySQL.

So that you dont have to spend lot of time synchronizing all of these tools.
installing one of these single packages will take care of all the tools mentioned before.
and just follow there instructions.

So that's it,once tools are ready you will have to learn PhP Programing,
(i strongly recommend the books "PhP and MySQL bible" or "PHP For Dummies" -- or just learn from the net.) 
and database accessing from PhP.( it is simple).
and then Program your software and copy it to the server directory in your system (Apache will take care of that).
then enter http://localhost
And you can watch your talents bloom.

If you are planning to make your server public, you will have to also take care of security settings.

hope that helps,
if you need any further help please contact me from tech-help page of http://blaisemcrowly.co.cc