Tongs are one thing that many new smiths have a problem with. I am by no means an expert on this matter either, and still have trouble with tongs because I haven't made enough of them. Below are some of the best You tube videos I have found on the subject that have helped my in my tong making needs. All these videos are the same but different (if that makes any sense) everyone has a different teaching style, and learning style; I would recommend watching all three so the information sinks in.
With this style of tongs you can make the bit (the thing that holds the metal) to any shape you would like.