the process for adding simple product options is fairly easy.
In the eCart Object Create the new columns, make sure to check the unique attribute.
Then in the eCart Add to cart button, select the option columns and set the Updatable As option to the correct type for form elemtn, Text, or select list as desired.
eCart will create the element on the page for you and handle the linking as well.
As for creating the display with the price or total, eCart is not configured to work that way, it will always add those columns for you, but you can remove them in design view of the cart display manually after it is created.