Would 2 lights solve my DSLR green screen noises?
The result of your key depends on many things. It would have been really nice to see a still of your footage before you keyed it. I believe you are working in after effects, which has a pretty solid keyer built-in called "keylight". Using the clip white and clip black settings under the matte-section will help you clean noise from foreground and background. You might want to throw a "roughen edges" onto your keyed footage and set everything to 0 before raising the amount gradually, which will give you a bit of a softer edge.

Other than that, proper lighting will be your only hope. Look for wrinkles in the screen, or shadows you or anything else throws onto it. Try standing as far away from the greenscreen as you can to minimize spill (the bounces green light thrown back at your body) and to avoid shadows of yourself on the screen. If the color of the greenscreen differs from the foreground at every place and has no shadows or wrinkles on it, you should be good to go.

If you want to you can send me a short clip of your unkeyed footage so I can try to key it as best as I can, so we can see how far you can push your current setup. Have a blessed day :)