Here's my $.02
If you want to learn how to stop efficiently, learn to hockey stop, but that will be in a while at this point. This is where your lead foot is swung out and ends up perpendicular to your direction and your drag foot is parallel, which your heel facing the direction you are going. Dragging your back foot will just wear your wheels down really fast. I think newbie skaters have problems remembering to keep their knees bent and center of grav low.
Also, dont keep your feet too close together, they should be around shoulder length apart if not a little wider at the beginning of a stride; otherwise you get a "knobby knees" effect which is really bad form. Try to always "follow through" on your strides, meaning at the end your foot should have a little kick downwards, plantar-flexing your ankle at the end of smooth strides. Try to avoid choppiness in your strides.
Some things to learn as you get better:
crossing over left and right
crossing over left and right going backwards
transitioning from forwards to backwards and viceversa smoothly
hockey T-stop
Good luck with your new skates!! If you get better, get into some recreational hockey leagues, they are so much fun.