This is what I would suggest for a beginner at crocheting. Just start making small squares until you're comfortable with starting, ending, and everything between. Later these squares can be sewn together to make a washcloth, baby blanket, scarf, etc. Size doesn't matter. I would suggest using a hook size G-J and light-colored worsted-weight yarn to start. (Black yarn is VERY difficult to learn with). ENJOY!
Step 1: Materials
These are the materials that you will need:
-a small amount of light-colored, worsted-weight of sport-weight yarn
-pair of scissors
-crochet hook (size G-J suggested)
-tape measure or ruler