Here's a great video to learn triple crochet.
The crocheted scarf will be 60" long before you sew the ends together. It will be about 9" wide.
Leaving a long tail, chain 130. Stop here to wrap the chain around your neck twice and make sure you like the length. Three loops will be used to "turn the corner" so you can subtract them from the length.
Row 1: Skip the first four chains and tc in the fifth chain from the hook. Tc in each chain across.
Row 2: Chain 4 to turn the corner. Tc in each chain across.
Rows 3-10: Repeat row 2.
Finishing: At the end of the last row, cut a 2-foot long tail. Pull the tail through the last loop on the hook to lock the stitches. Fold the scarf in half and use the yarn tail to sew the ends together using a slip stitch. Weave in any loose ends and the scarf is ready to wear.