1. You mean the Green Latern villain? I think that it has never been stated.
2. "Firelord possesses the ability to manipulate cosmic energy in the form of stellar fire. His entire organic carbon-based body was transformed to accommodate the nuclear energies that course through him. These energies make him the humanoid equivalent of a miniature sun. Projected from any point on his body at mental command, Firelords energies encompass the entire electromagnetic spectrum possessed by a star: heat, light, gravity, radio waves, and charged particles. The maximum amount of energy he can produce at once is determined by his mass. When all the atoms of his body are in fusion, his energy level is equivalent to the outer layers of a small star. By the slightest manifestation of his stellar powers, he can burn through any Earthly substance (with the exception of Adamantium). He can project a stream of fire resembling a solar flare for distances measured in the hundreds of miles. Firelord can control the path of his cosmic fire to such an extent that he can project a sustained ring at a fixed distance around a person or object"
3. Drax uses cosmic energy, doesn't he? I think he is able to augment his strength to increase into upper levels with it. Maybe he is Class 40 without using the cosmic powers to augment his strenght.
4. Not calculated. I guess that as he is composed by ionic energy, he can fly as fast as ionic energies that power him...I am not an expert on this, though.