there is not one tutorial that covers from beginning to end, there are to many variables to creating a store.
the basics are:
1) Add the Add to cart buttons to the product pages
2) Create a cart display page
3) Run the checkout wizard to create the checkout pages.
while running the checkout wizard, you will be able to set up basic tax settings.
you can also select to use fed ex for shipping.
If you need to modify the tax or shipping settings after running the checkout wizard, you can edit the eCart object.
if there is something specific you need help, please let us know and web can offer direction.