Hi there and welcome!
For pellets there are a few things to watch out for. Some pellet makers (I think Traeger) use oils to "flavor" their pellets rather than the pellets just being of the wood type you want. Others may not use all hard woods or fruit woods which is frowned upon. Also others do heavy blends so it says "Hickory" but is only 30% Hickory and blended with 70% Oak or Alder, etc. so you really don't get much of what you are looking for.
The best route is to get an all hardwood/fruitwoods, no oils added, 100% wood pellet of that type like 100% Cherry. Now if you want to do a blend there is nothing wrong with that as long as it is no oil added and is blended with what you are looking for. For instance, Mesquite is too strong for many and so a 35% Mesquite and 65% Maple blend might be right up your alley.
Lumberjack Pellets make 100% pellet options where it is simply just 100% of the wood listed on the bag. They also offer blends but again if it is a Maple Hickory Cherry blend then that is what you get and I bet it is 33% of each unless otherwise stated.
CookingPellets does a 100% hickory and then their perfect blend which is equal parts of all of the woods listed on the bag.
I have never put my AMNPS inside the MES but I believe many put it on the bottom left of the smoker when looking into it.
You might need to put a fat deflector over the AMNPS when cooking a large cut of meat like a brisket so it doesn't drip into the AMNPS.
Most MES owners do a mailbox modification when using the AMPNS with the MES. The mailbox mod allows you to get the best airlfow, keep the MES from bothering the AMNPS and vice versa, and finally it allows you to cold smoke easily.
They come in many shapes and sizes but here is mine using a wall hanging mailbox rather than the traditional mailbox :)
I hope this info helps and I look forward to seeing more of what you smoke :)