Depends on what country you are in, there is a wealth of knowledge on here I suggest you invest some time in reading. Remember bitcoins are not illegal and are becoming more popular for all sorts of goods and services, however it is a good idea to remain as anonymous as possible as if you were ever faced with having to explain away a mysterious letter/package that you obviously had no knowledge of it would be less plausible if you had easily traced bitcoin purchases made from your bank account. I only buy them via cash deposits over the counter in banks in my country, you can book the trade via a fake email address. Like I said it depends on where you live really as to what your options are.