I just started learning the basics and I have never done a pattern before. I have learned how to make a sc and dc, but that is it. I wanted a challenge, so I chose to make a baby hooded afghan. The main stitches are sc and dc. Since those were the ones that I knew how to do, I chose to do this pattern. It starts with the hood. Instructions read:

Pattern stitch (multiple of 3 sts):
Row 1: 2 dc in 3rd ch from hook, *skip 2 ch, 1 sc and 2 dc in next ch; rep from * across, ending with skip 2 ch, 1 sc in last ch. Ch 2, turn.
Row 2: 2 dc in first sc, *skip 2 dc, 1 sc and 2 dc in next sc; rep from *across, ending with 1 sc in top of t-ch. Ch 2, turn.
Rep Row 2 for pat.

Now, I am also confused with the first line of Row 1. 2 dc in 3rd ch from hook to me means a half double crochet since it starts at the 3rd chain when making one. Do I make a double or a half double?

I have been reading online for a few hours and I found a website : www.crochetnmore.com/123readapattern.htm. I am aware that I may sound like an imbecile, but I learn easily when I am shown not from just reading. I am aware that it contradicts why I am asking on here, but if I can have someone explain to me the basics of how to start the chain, then it will be helpful. Thanks!