Wills, probate, letters of administration, powers of attorney
Yes, you need a will otherwise distribution of the estate will be expensive and according to the relevant estate laws and not how you may wish it to be.
You also need to nominate a beneficiary to the life insurance company otherwise the insurance company cannot pay out until the estate is granted probate. This could take years, especially if there is no will. But with a nomination and a death certificate the insurance company can pay usually within a month.