Estate Planning Made Simple Professional Experience. Exceptional Results. At Advance Planning, A Law Corporation, we are a new kind of law firm for a changing world. We are consistent, patient and professional, giving each new case the attention it deserves. An integral part of our services is to work closely with our clients so that they can make the right decisions with respect to their estate planning needs. We focus on trusts, wills, powers of attorney, and above all else, client satisfaction. Our main office is located in Manteca, California. We have a satellite office in the Pocket neighborhood of Sacramento, California.