Here is a link to the basic stitching abbreviations.
Since you are probably just beginning, dont' go out and get the soft, fuzzy, fancy yarn you'd like to stitch a blanket with. Get a cheap, basic yarn with no frills, preferrably a small skein or ball of yarn because this is your "learner" yarn. The kind I used in my samples is Bernat Cotton Tots, 4 oz., worsted. Here is a yarn weight link in case you're interested.
A good starter hook size to learn with is size "I" or "J". Your yarn should be compatible with your hook so you're not struggling with uneven stitches.
Start with making a slip-knot with your yarn like this.
Many people wrap their thread around their fingers differently, but this is how I do it. You need to wrap the yarn correctly so you have good tension. If you don't have good tension, your stitches will be uneven and sloppy - kind of like a sewing machine!
So here we go: Palm up, put yarn between pinky and ring finger, wrap around & behind pinky, over the top of your back fingers, and with pointer finger extended, hold the slip knot area with thumb and middle finger. This will help you have the right tension when you stitch.
Now you're ready to chain. Put your needle underneath your yarn, or (yo = yarn over), grab a hold of your yarn with the hook, and pull it through the loop.
Now, you're a smart cookie, so keep practicing until you've got this down pretty quick - from startup, wrapping your yarn, and stitching a lengthy chain that looks tight (not too tight) and even. It should look like a nice braid on the front side.
Note: If your yarn is too loopy or loose, you need more tension with your fingers holding the yarn. Practice your basic chain and play with the tension in your fingers until you get the desired result.