Beginner material for mathematical logic

I am looking for study and beginner material to study mathematical logic. I understand that it is a very broad topic but I would like to know what the best path there is to learning mathematical logic. Where should one start? What are the best resources? If someone could paint a time line of events that should take place in order to gain a good understanding of mathematical logic, that would be fantastic. I have seen this question but it does not give the depth I require.

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  1. For a heavily annotated and detailed Guide to teaching yourself logic by a selection from the many many available books, try my Teach Yourself Logic at http://www.logicmatters.net/students/tyl/ It aims precisely to enable a student to move on “step-by-step”.

  2. I’m not sure quite what you mean by “paint[ing] a time line of events that should take place in order to gain a good understanding of mathematical logic”; but TYL does have a crude map of the way areas of mathematical logic relate to each other which might help.