HTML - Newbee

First let me say I am happy to have found this site. I am a HTML and DreamWeaver newbee. I have been a server engineer and network specialist for several years.
I am now transitioning with the hope that I can have more control of my time, and hope web design will help accomplish that.
I am at this point self learning using Patrick Carey's HTML, XHTML and Dynamic HTML.
I need help with code for the following
1. . Create a style where all H1, H2, and H3 elements are centered, text is
blue, and each has a 3 pixel ridged red border (all 4 sides of the
border are red)

2. Create a class called td where all td table items in the class have purple
text and a green background

3. Create a class called td.special where all td.special elements in the
class have white text, green background, and font-weight bold

4. Create an ID called important where the element using this ID will
have italic text that is vertically aligned to top

5. Create an HTML table having three rows, with three columns per row.
Assign the td elements of the second row the class td.special

6.Create a complete HTML
document that includes a rollover effect using one mouseOver image,
and one mouseOut image. The name of the page is MyRollover.html.
The initial image is named pictOff.gif, and the rollover image is named
pictOn.gif. Using the appropriate mouse events, the pictOn.gif image
will replace the pictOff.gif when the mouse hovers over the original
image, and pictOff.gif will reappear when the mouse moves away from
the image. Position of the images on the page is not important. Use any
names you like for the interior names of items used in the script.

These are the book assignments giving me trouble any help is greatly appreciated.