Thanks for the overwhelming number of responses!
In the interest of helping others who might have similar problems, let me explain that a large part of my problem regarding Shipping & Tax had to do with configuration! I have not found this explained anywhere!
When setting up your products, the product apparently must have something indicated for Weight. Similarly, when configuring Shipping Configuration, you cannot use a zero value for Amount Per Unit. The minute I stumbled upon this, all of a sudden things begin functioning on the checkout page! Joy!!!
I'm trying to get the total Shipping & Handling amount to be $24.95... as long as the minimum order amount of $70.00 has been satisfied, and to have that amount be zero (Free Shipping) if the order total is $200.00 or more.
WHAT IF... I set the weight of the product to .001... could I then change the logic somewhere so that the total order weight gets rounded up to the next highest amount? I'm thinking this might work, so that's where I'm heading in my experimentation! Can anyone provide a clue as to where/how I might make this change?????
[EDIT] Maybe the title of this thread is a little scary? I'm going to make small questions in new threads....