Hi, welcome to AA.com!
I am in the process of setting up a 10g nano, and another member on the forum (nodoubt471) is doing almost the same thing.
Since you already have salt experience, the nano is going to be pretty easy for you. I presume you already have all the test kits and a lot of patience. Get some power heads for water movement, substrate (aragonite is good for a small tank), live rock, and cycle the tank. You can get by without a skimmer if you do weekly water changes. A refugium might be a good idea as well to help stabilize the tank. Once everything cycle, you can add a small clean up crew, wait a few weeks, then work on adding basic corals and fish.
The smaller tank will require you to test water conditions and keep up on maintenence much more than the larger tanks, keep that in mind.
2x Sunburst Platys (2M, 2F) // 3x Neon Tetras (?) // 2x Cherry Barbs (1M, 1F) // 2x YoYo Loaches (?) // 1x Bushy Nose Pleco (M) // 1x Clown Pleco (?) //
-30# Live Rock
-Mixed Snails (Nassarius // Cerith // Astrea // Black Turbo // Mexican Turbo)
-8x Blue Leg Hermit Crabs // 1x Banded Serpent Star // 1x Cleaner Shrimp
-1x Royal Gramma // 1x Percula Clownfish
-2x Mushroom Leather // Metallic Green Star Polyps // Pulsing Xenia // Striped Xenia // Blue Mushroom
-Remora + Maxi-Jet 1200 // 2x Maxi-Jet 600 // Maxi-Jet 400 // Visi-Therm Deluxe 50 // Current USA Orbit 2x 40w PC