Your bike shop sucks. Single-sided road pedals right away on a brand new road bike?! I had some rough moments switching to these after riding THOUSANDS of miles with double-sided SPD mountain pedals...and before that I'd logged some miles on a clunky mountain bike with just platforms. Ignore their "advice" and master one thing at a time. Road bikes do feel really unstable at first. Trying to deal with clipless pedals from the start just adds another big factor to learn. For many (most?) of us it would be too much to take in all at once.