I have always been interested in web designing but the problem is that I don’t know where to start particularly when it comes to the needed tools. Aside from that I know that there are some considerations or guidelines that needs to be considered in web designing and I wanna know when and how to apply it when making a design already.
Can somebody give me an idea? 
It all depends on what your methodology is. I use a program called Serif Web Plus, it’s so easy to use and you can make the exact same sites which you can make in Dreamweaver, it’s just Serif is much easier to use. Google Serif Webplus and have a gander at it.
[FONT=verdana]You should start by learning the basics of HTML and CSS. You should do that before you start looking for tools. Even if you eventually find a tool that avoids the need to write your own HTML, you will still need a fundamental knowledge of the language.
The best advice is start learning HTML and CSS. As you progress, try putting what you have learned into practice. Create a simple site for yourself, coding it by hand using an ordinary text editor. You don’t need to register a domain or sign up for hosting - at least, not until you are ready to show your work to the world.
Once you’ve got past those basic steps, you’ll be well placed to decide what tools you need, and what further techniques you will need to learn.
Mike
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Yes, you absolutely need to learn the basic tags for html and css and be able to write some code. I have seen only a few exceptions to this where people were absolute masters at photoshop and the coding was left to others, but this is rare. I would recommend a combination of building a few things of your own from scratch, but also learning how to hack what others have done, like changing colors or positioning or fonts of an existing design. That way you can see the structure used by people already skilled in design.
First you need to decide what you`re going to do : code , design or both? Then you have to ask yourself if maybe in the future you would like to be employed by a company to do that job. Then find out the industry standards like for design - Photoshop, Print, vectors - Illustrator etc. Pretty much Adobe’s products are standars today.
I am not expert one.
That no doubt, Html is fundamental if you want to create web.
CSS is also essential one.
Don’t forgot JavaScript ( I hate it I has crated 2 websites, with little knowledge about it ) .
One important is graphic design.
One of my best ( and only know ) is
Photoshop.
That what my knowledge to create simple website
I’m agree with previous commentators that first of all you need to decide for yourself what exactly will you do - code, design or both. Believe me that making all of it in the same time will be difficult for you as a first steps. So focus your mind at coding or making the design and try to look for good educational materials.