"Letters of Administration" or "Authorization to Administer Under the Independent Administration of Estates Act"?

First of all I strongly encourage you to hire a probate attorney. The money they cost will save you money and time and anguish. Really. There are so many ways a lay-person or even a non-probate attorney can cost themselves money. Second you probably want to ask for BOTH of those things you ask about.  Letters of administration is just the general thing you are asking for and the IAEA authority is an add-on but always requested.  If there is real estate you should ask for "full" authority under IAEA. If not real estate then limited is fine. Good luck. -John