Isabella’s Amulet is equipped on your character at character creation. It is in the slot next to the bag slots. Every character you make will have the amulet already on it.
The title is in the BIO section of the Esc menu. There is a dropdown box to select your title to display.
There are a bunch of emotes in game (I forget the key to bring them up) where all your emotes are; the basic ones, any you buy, and your free bonus ones.
Any weapon and armor skins are just that, SKINS. You right click a piece of gear you have equipped and select “Change Skin.” There will be a list of several Cash Shop skins and also your Bonus skins and any Twitch Drop skins to choose from.