I am currently a webdesigner.I know photoshop,dreamweaver,css and flash.I want to develop websites rather than design.I want to start it now.Should i start right now or after some time and with what should i start?I am since six months into this field.Please help me.
I think you should start now if you're interested in it. They say there's no time like the present.
Read about Ruby on Rails, Django, PHP, Java Servlets, ASP.NET. Decide which you think most suits your needs, capabilities and workflow.
As comments and another answer have said, "yes". However, I don't see you explicitly listing HTML under your skills. If all you've done to create HTML is Dreamweaver WYSIWYG stuff, I would recommend getting a better understanding of HTML as well - if not first, then at least concurrently.
I personally feel that it would be beneficial to both you and your career if you could take part in the coding of a site as well as it's design. And as you learn more about web-coding (I'm assuming you have no coding experience) your view of how you approach webdesign will change as well (for the better).
Depending on where (front/middle/back respectively) you want to develop most:
Try installing XAMPP if you want to run a full development server locally. XAMPP
Best of luck.
Here's the book I started with a decade ago:
Highly recommended if you're just getting into development. PHP is a very popular language to start with.