Designing professional webpages requires some skills of HTML/CSS as well as Internet knowledge. Web pages are hosted in web servers, and web servers are connected to Internet. Also, designing webpages proficiency may require some other design skills since you will be responsible to layout the page and split it into sections like Header, Body, Sidebar and Footers.
There are many webpage design programas available in Internet. Some are free and other costly, but the important thing here is not the software itself, but your knowledge. You can even use the Notepad if you have HTML/CSS skills. But you can also use Adobe Dreamviewer or (awful) Frontpage if you need a paid software. There are other free and costly tools as well. Adobe for example has been focusing on web editor and design packages.
For basic webpages in HTML/CSS there are many resources on Internet where you can find free layouts: fluid, flexible, fixed, so you can download and that will made the things easier since you have a code base for start with your project. Also these basic webpages may growth to more complex webpages later.
