This was one of the first scarves I ever created and is probably the best pattern for a beginner to practice.  It was created with a Baby White Red Heart Fiesta Yarn.

Chain across 17 stitches, then in the second stitch from the hook, single crochet all of the way to the end of the chain.  Chain one and turn.  Continue this pattern for the length desired.

To add the tassels simply cut the strings to double the desired length.  Fold in half.  Combine as many strings as you wish.  Put the needle through the end of the scarf.  Loop the tassel strings over the needle and pull through the scarf.  Pull the loose strings through the loop created to create a knot.  Repeat the tassel tying process until you have as many tassels as you like