Mr. T:
First of all, welcome to the forum.
There have been numerous posts in the past regarding this, but I have not seen one in a while, so it is a good refresher. I have a carload of accessories, but here are the basics that I do not go without.
First of all, I have 3 coils for my Garrett CXIII. I usually stick with the standard 8.5" coil, but I also have a 12.5" Deep Seeker for areas where there the trash is minimum, and I have the room to swing it. The 4.5" is great for very trashy areas, but it doesn't cover as much ground. I also carry a pin-pointer. I am currently using a White's Bullseye, which I am very unhappy with. I usually carry a small digging trowel, but I also have a small shovel for areas where it is required. I have a probe, which I use in parks or on manicured lawn where digging is a problem, but most of my digging is in wooded areas. I also wear gloves to protect my hands fro sharp objects and to prevent (with some success)poison ivy
Those are my basic accessories, but here are a few "also recommended" accessories:
BOTTLED WATER: If you are like me, you can get so focused that you forget to hydrate yourself. On a good hunt, I have gotten lightheaded before I realized I was dehydrated.
FIRST AID: Carry a simple kit "just in case".
CELL PHONE: Don't leave home without it.
GPS RECEIVER: Especially important if you are hunting off the beaten track. I use a simple Garmin eTrex, which retails for under $100.
ONE IMPORTANT NOTE: Always let someone know where you will be detecting, especially if it is off the beaten path. I hunt in places that are many miles from the nearest road with no cell service.
I hope this helps!
Good Hunting,
Neil