I'm sure this is a really silly question, but I'm really new to knitting! I was just wondering, the differences between needles, what are the proper names of each needle...I know double pointed needles are that, but what are the needles that are attached with wire, or tubing? Are they the cirular needles? Or is that something else? The pattern for a bag I plan on making calls for Size 4 circular -2 pair 29". It also calls for a set of dpn's which I'm okay with, as well as size 5 or larger, which I assume are the regular straight needles? I really have no idea...I think now I'm more confused that when I started writing this post!