Do you have a favorite cleaning brush? Grill topper? With my new grill, I will need a few accessories. Other than metal kebob skewers, I need to start over. What tools do you like?
I’m a new griller, but so far I have bought:
Grill Grates.
A digital thermometer that you stick into the meat - it reads immediately and has really helped me with knowing when my steak and chicken was done. ETA: I just learned from gouf78 on the grill thread that these are called Thermapens. 
A special grill cleaning brush and spatula made to go specifically with the Grill Grates.
Several different planks that you can use for various meats. I had been familiar with cedar planks for salmon, but there are actually others you can use for chicken, pork, and beef.
My birthday is coming up, so I’m going to ask for one of those fancy thermometers that tells you how hot your grill is at any location on the grates (you can have hot and cold spots even with all burners turned on, and I would imagine if you are using charcoal as well).
I’m like one of those people who have just found a new religion or just started a new diet: very enthusiastic, but people are watching me with skepticism to see if I stay at it. 
Grill handle light! It turns on automatically when the lid is up and illuminates the grilling surface.
https://www.amazon.com/Weber-7516-Grill-Handle-Light/dp/B000WEKNYW
Can someone link to the grill grates. I think I am confused.
Honestly I just use a small metal spatula to clean the grill. I don’t like a brush, it gets fibers all over the place and looks gross afterwards.
I have a meat thermometer but I never use it either. I use to, now I’ve figured out how long to grill on my grill. Other grills, like at a cottage, I fail at but I’ve got mine pretty good. Grilled a great NY Strip a perfectly medium rare last night.
Like at fancy restaurants, I cut into steaks for my guests. A steak can be sent back for more grill time - not ideal, but works. I do want a termapen!
We have a cheap-o version of a therma pen. Love it, works fine. We also love our clunky-looking but very functional, silicone grill gloves that go halfway up the forearm. We’re using both for our barrel-style smoker rather than for a grill, though.
If you count the smoker as a “grill accessory,” then it’s my favorite. It’s a Pit Barrel Cooker, and it’s pretty much idiot proof. It runs on charcoal (we like Stubbs), the meat hangs vertically on hooks, and it makes the best chicken and tri-tip I’ve ever had anywhere.
@Deb22, here you go:
You can go to YouTube for unbiased product reviews of the grates.
Be sure and get square metal kabob skewers. That was the food does not turn on the skewer.
Good idea on the skewers. I like the look of those grill grates. Do they stay attached pretty well? The thermapen looks useful, too.
I got the grill gates that are measured perfectly to go on your grill and replace your original grates. They stay on as if the grill had come that way. A lot of the videos I watched were of the ones that just sit on top of your original grates, and they seem to do just fine.