I'll help you get started, but you have to do some experimenting on your own, I'm afraid.
Your first order of business should be to go into your admin control panel and choose the 'modify'-option under the Replacements-heading in the bottom end of the left column.
Now edit the options thusly:
<body> should be replaced by <body text="#000000" vlink="#006da0" alink="#006da0" link="#006da0" bgcolor="#fffdfa">
{ contenttablewidth } should be replaced by 600
{ titleimage } should be replaced by
http://www.digichi.com/makemoney/affiliatesmalltm.gif
In {largefont},{normalfont} and {smallfont} you should remove verdana,
That's a start. Now go into 'modify' under the Style-heading and play around with the main colors. Good luck!