* SPOILERS *
You get to ride Odahviing once as part of the main quest of the game. You don't get to control him though. You simply get on his back and he takes off, the scene cuts out and you arrive at your location to find Alduin.
You can play as a dragon Burning Skies - Flyable Dragon Races 3 mod by ElSte17 and UbuntuFreakDragon on the Skyrim Nexus. If you just want to fly, you can ride dragons in the Dragonborn DLC.
a necklaces, you can only have one on at a time
No. Dragonborn needs Skyrim to run
sadly, no
The only ridable dragon appears at the end of the main quest mission 'The Fallen', and it is not any kind of steed, it simply does a cutscene to take you to a different area.
NO...
Red dragons do not exist in Skyrim. There are green, brown, bronze, white, and the end game boss Black dragon.
A dragon found at the Throat of the World in Skyrim.
Yes, there are stables at most settlements, you can buy/steal horses and ride them.
The closest you get is a shout which can summon a dragon who has allied with you, this happens during the main quest.
There is no Dragon Priest Armor, only their masks.
you have to make it yourself