Welcome fellow Silverton 810 owner. I've been living mine since I got it almost 2 months ago. Before that I was using a Pro 34.
Anyways... I still have done testing I want to try on the Pellet front. Tons of people on here say to use Lumberjack brand, and I have, yet I felt like the Traeger brand produced more smoke. Again, this is something I want to test.
In regards to drop tray liners, I just use the wide heavy duty rolls from Costco. It covers the tray completely. One thing to be careful of is that cooking at 500° can and will cause your drip tray to warp, it's happened to me twice now. I got a replacement the first time and haven't called in the 2nd one yet.
I covered mine with lava lock just after I got it. Do a Google search for Lava Lock Silverton and you should find a video showing where to put it all. I use this one because it's black and blends in with the grill better.
My very first cook when I got my Silverton was a full packer brisket. It took 27 hours and boy was it delicious. I wrapped it in waxless butcher paper.
If you want to get smoke flavor on your food you'll find it's best when the temp is set to 225 or lower with super smoke.
When it comes to cleaning, I vacuum out the ash, change foil on drip pan, clean drip bucket and clean grates after every cook.
Enjoy
1/2" wide, 1/8" thick on my Silverton 620.