In order to change the registration form layout you should edit thecomponents/com_virtuemart/themes/YOUR_THEME/theme.css file.
In the above path replace YOUR_THEME with your actual VirtueMart theme.
For example if you want to change the text alignment find the .formLabel definition and replace the following line:
text-align:right;
with
text-align:left;
You can also modify the other CSS settings.
A good solution is to use a Mozilla Firefox addon like Firebug and inspect your web site elements. In this way it will be easier to define which files should be edited in order to complete your requirements.
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