The first obvious step is to get a deck to start using. Its best to get a deck of bicycle rider backs because they are easy to find in a store and are good quality for flourishes however most decks will be fine as long as they are not bridge sized or really used and dirty.The next step is to learn a couple of grips that will help you a ton in the future don't take to long on this just learn to make the deck sit comfortably in the hands at these different positions a tutorial of the grips is down here
Swing Cut Approximate time to learn is 10 minutes or less
The swing cut is a very simple and easy beginner shuffle this will help in alot of future flourishes and its a great confidence builder.
Here is a tutorial
Here is a tutorial