I do web programming for a living so if you write a little more about what you are wanting we can make better suggestions. Kathy's tips are great. Here are some more.
1. A good website is one that is updated regularly. Commit yourself upfront to keeping it fresh and current.
2. Color and style must be thought out ahead of time. Nothing makes a worse impression than colors that clash or do not fit with your purpose. Don't use a lot of primary colors (red, yellow, blue) together. Pick a color and then try to use shades of it with maybe a complmentary color to contrast.
3. Consistency, consistency, consistency. Make sure all the pages of your site have the same look to them, and that you navigate thru your site by the same mechanism on every page. If you use a left menu on the home page, use a left menu on every other page. If you use a top menu, then do that throughout.
4. For the most part pick a font and use it throughout. Don't use 10 different fonts. Keep it simple and consistent. You can use different sizes and formatting to provide emphasis where you need it. One exception would be if you have a logo or something similar. That's fine if it's not the same font as the rest of your site. Verdana is a good font for web design.
5. Images - the better the quality of the images you use on your site, the more professional your site will look. Again, nothing looks worse than a bunch of hokey pictures; people with their heads cut off; dogs or cats (or people)with red eye. Also, images for web pages don't need to be very high resolution. The smaller the file size the faster they will load. Use .jpg format for complicated images (those with lots of color shades and contrasts). Use .gifs for solid colors like backgrounds and such. Try not to use .bmps. The files sizes are usually too big to load quickly.
6. Scrolling down the page is OK. Scrolling left to right on a web page is not. Make sure your pages are designed so users don't have to scroll left to right. Design your website for a screen resolution of either 800 x 600 or 1024 x 768 (these are the settings for your monitor display)
7. And most important, be VERY CAREFUL about what personal information you put on your site. There are lots of whacko's out there.