Welcome.
As a new user myself maybe I can start you off.
1st. Do you have any html editing software?
2nd. As far as I understand it you build your html, CSS, the way you normally would and include the MT tag/code where you want the data to go. For example you might want a centered table with borders to enclose your entry. So you create the table and then enter in the MT tag/code into that table and voila!
You can alter the default Stylesheet in MT or build your own from scratch. www.webmonkey.com has an intro to .css you might wanna look at. There are plenty of resources on the net.
Of course the degree you are familiar with the elements needed in construction the easier it will be to get what you want. I spent many a long day/night wondering why my layout wasn't looking the way I wanted it to until I learned the correct way to do it.
Goodluck!
P.S. Always search the forums, girlie's site, and any other MT related information sites before posting a question about a this or that, or you might get a beating by the elders.