Germinating seeds

My first 6 seeds I put in distilled water in solo cup in a cabinet till root came out!! All perfect, last 2 I did 1 one root separated and other nothing!! Should I just put in paper towel and keep damp in window sill or In the dark??

I've only germinated 4 seeds but they were all successful and sandwiched between damp paper towel in a dark, warm place. Just make sure to keep the towel slightly damp (never let it dry out completely). The fastest one I had germinated in a day. The longest was about 4 days.