Q: where would i start if i were to write music without touching an instrument? in this case how would i "play around" and experiment?
A: i think it just depends how much experience you have with music. Compare it to your level of experience with speaking and writing english, which i assume you've been doing for a long time. I'm sure you could compose several paragraphs of words, without speaking. What's most helpful in this situation is the ability to write it down somehow, and a reliable writing system which you are comfortable with