That's a bullet style smoker right? I understand your logic for a somewhat simple cook, but it's very important to learn fire management with any new cooker. So it will likely take you an hour or so to play with the vents and get a cooking fire stabilized and let your flavor wood chunks get settled down for good smoke. This will be repeated each time you use the cooker, so spend some time before you get food on.
Salmon is not a long cook at all, and if you buy a skin-on fillet you won't have to worry about turning it. Watch for the (white) albumen to form in pockets because that's a good signal the fish is almost done. Then just temp it and you are good.
The chicken can take up to 90 minutes depending on the pit temp. If you let the skin dry for 12 to 24 hours in the fridge before smoking it, you will have a better shot at crispy or bite-thru skin.