You're that new socal player who has been posting in the FB group, ya?
First of all make sure you've read these two stickies, they're pretty good:
http://smashboards.com/threads/hao-to-fazfall-thru-platz-fasta-like-shia-chawps.273161/
http://smashboards.com/threads/mogw...gue-of-legends-and-doesnt-write-stuff.203781/ (The whole first post and thread is pretty good but for the purposes of just movement, you should read the laser section.)
Basic important stuff you don't want to mess up:
Make sure your shine -> platform wavelands are clean because you'll need them to combo a good portion of the cast.
Make sure you can waveland from the ledge with at least some invincibility. He can get away with doing easier options from the ledge, but waveland is hella good if you're confident in it
Make sure you almost never get stuck in your shine. (I.E. the timing is a little different when you hit someone with it.
DD vs laser is kinda broad but I'll give a broad answer lol. Laser is essentially your tool for locking them down in their shield or stopping their movement so that they have to approach you in certain ways and from certain angles. Basically, it's falco's tool to quickly take stage control (not quite as easy as it sounds vs better players but a great tool nonetheless). With dash dancing, you bait out the opponent to attack you (usually from shield or from platforms, but those aren't the only places, just the most common as falco). DDing allows you to punish the opponents habits while not really committing to anything, keeping you in a low risk-high reward situation.
Shielding question is even more broad haha. Just learn how to shine out of shield really well, and you'll get a feel for shielding on your own. And if you remain confused, you live in socal, and you can ask someone irl (cuz it's probably easier to explain irl).