When a room is perfectly soundproofed, outside noises such as footsteps, highway traffic, and air conditioners stay outside of the soundproofed area, and inside noises, like those coming from your instrument or voice, remain inside.
Create clearly labelled folders for the samples that you use or think you might use soon. You can categorize your samples in broad terms, for example, as acoustic drums, drum machine, synth, vocals, or by the name of the sample pack they came from. Then, from there, you can categorize them by type, such as one shots, loops, ambience, pads. Organizing your folders so you can find the right sound a lot quicker is optimal for fast-paced writing sessions, bigger and complicated projects, or time-sensitive work with approaching deadlines.