Check out this blog post from Eerdmans where several respected theologians give their advice on theological writing and research. I echo Keener’s appeal to learning – right from the start – how to organize and archive your notes and research. It has taken me over ten years to find a good system, and I am afraid I wasted many hours in the past re-tracking down information, or simply giving up on ideas where I could not find or remember earlier thoughts and notes. In terms of systems, I use Google Keep for day to day self-reminders, and GoogleDrive folders to store my research.