My name is Dr Stephen Strange, and yes, I'm able to cast spells.
1) Master of the Mystic Arts, but sorcerer is less pretentious.
2) What I do is harness dimensional energies to manipulate aspects of reality, which includes, but not limited to, astral projection, teleportation, offensive and defensive spells, and summoning items.
3) I draw power from Universal energies, usually through specific hand gestures and concentration of will. This strengthening of the mind and willpower is done through meditation, which also helps to focus Chi.
4) In my universe, my magical Order's sole purpose was to safeguard the Earth planet from magical and interdimensional threats. I was made caretaker of one of three bases of operation positioned around the globe, the Sanctum Sanctorum in New York City. When I came to Tumbleweed, the Sanctum was already there. Although I'm not in my universe, I still feel responsible to use my abilities in times of need. I also am willing to take on pupils.
5) I wanted to form a Coalition of magic users, and had reached out to ask if people were interested, but the portal pulled us on this cruise ship, which put a pause on my plans. But it's something that I still want to do, and I think it's important.