To make designing your web page easier, you can get all kinds of WYSIWYG editors from download.com & use em on a trial basis. (Some editors leave a meta tag and they will come after you if you don't edit that out of the HTML)
Here's some advice - I'm not a pro, but a studied amateur
1)As Mx62 says, consistant appearnce from page to page is crucial.
2)I also suggest you use frames to control the appearance of your text.
3)Also, bag the centered text. That looks real amateur.
4)All those colors -- wow I'm glad I'm not a migrane sufferer. Here's another good principal for you with text - two is the magic number. two colors or two font types. A classic mix is Arial for headlines, times new roman for text, one color for both fonts. OR you could use just Arial, but use say, Plum color, bold weight for the headlines and arial dark grey for the body text.
Try applying these simple principles and you will see what a difference it can make.
ps: I got these basic concepts from a book called "THe non-designers design handbook" by Robin Williams.
ps: I sound real bossy, don't I? Sorry...