I am a beginner with Gamestudio.The Gamestudio consists of WED,MED and SED.If I
want to develop a game,how can I use the three editors ? I mean that I want to know the detailed process of using the three editors to develop a game .For example,when should I
open the SED during the process;when I opened the SED,whether should I new a project first or directly program;whether should I put the models in an advance completed folder first or import them during the developping process?

if you want to script, use SED, if you want to model use MED and if you want to make a level use WED
sorry for that silly answer, but i guess there is no other one, you can do it how you want and how it's easiest for you

It depends on your skill and knowledge about 3dgs.

A beginner should use WED first. Insert the blocks and entities (models).
Assign the template actions to them, buld the level, and then run the game directly from WED.
-> look up for the tutorials for the templates.

If you are an experienced developer:

You make a basic simple Map in WED.
You create a new project in SED, and implement the basic initialisation functions.
(opening the testlevel, setting screen-resolutions, capturing key+mouse inputs)
And then you create your actions and scripts.
You can either create the models/entities in WED and assign acions, or you create them in
runtime.

MED is your repository for looking at, manipulating and creating models.
In the very first stages of your game you just need some test Models.
In later stages you create or convert models and terrains as needed in your game.

Depending on your type of game you will either work mainly in SED (changin the behaviour of the game,
and debugging)
, or in WED (editing and testing the levels)

In my honest opinion. Nike says it best. Just do it.

There is no set order really. As stated previously use med to create models ex. Characters, props ect. Use wed for level design and sed for scripting.

Theres a ton of useful information here and on links. Downloads page has c-script tutorials ect. I allways mess around with programs before ever reading any information to see what I can figure out on my own. 9 times out of 10 I can get the basics with out reading a single line in any documents. However once you reach the limits of doing with out knowledge then reading is essential. Theres plenty of tutorials ect here on the forums , download page and magazine. Lurk more... almost every beginers question has been asked and answered at least once in this forum.