I'm an old-hand at crochet...been doing it since I was 5yo (thanks to a crafty mother). Could probably do it in my sleep. The chain stitch is the equivalent of casting on in knitting...that is, it is the foundation. The simplest stitches are the single crochet and the double crochet. The basics... stitches are formed based on the number of loops you make with the yarn/thread (that is, the number of time you wrap the yarn around the hook).
To start making your foundation chain, knot a loop around your hook, wrap the yarn around the hook and pull it through that loop. Voila, you've just made your first chain stitch. After you have made the required number of chain stitches, you're going to reverse directions and use the chain stitches as your foundation. In other word, insert your hook through the second chain stitch from the hook, yarn over the hook, and pull the yarn through the chain stitch. You'll now have two loops on the hook. Yarn over again and pull through both loops. You've just completed your first single crochet. Notice that you did a yarn over once after you inserted your hook through the chain stitch and pulling it through, thus creating one "additional" loop on your hook...hence a "single" crochet stitch.
To make a "double" crochet stitch, you'll yarn over twice after inserting the hook through your foundation stitch and pulling the yarn back through your foundation stitch. That will result in three loops being on the hook. You'll then yarn over and pull through two of the three loops on the hook resulting in two loops on the hook. Yarn over again and pull through the remaining two loops on the hook. You'll end up with one loop on the hook. Double crochet completed!
One thing to keep in mind that seems to confuse new crocheters...you always have at least one loop on your hook. This is how you carry your yarn forward. It's similar to how you have multiple loops on a knitting needle.
Don't be intimidated by crocheting. I can tell you from experience that knitting is a lot more difficult to learn and to do...at least if was for me (thought I'd never get the hang of using two needles along with managing the yarn instead of having just the one hook and the yarn!)
Unfortunately, I don't know of any websites that have videos for crochet that are as good as KnittingHelp's vids. But you can PM me if you have any questions. Good luck!