As the title says, I need some help. Coastlines have always been a problem for me. It's exceedingly hard for me to create detailed, natural-looking landmass outlines, mostly because I have no real process for it.

Anyway. Basically, I'd like to know how you do it, in hopes of picking up some techniques. What's your process, from blank page to detailed outline? I don't need anything really in-depth, although I certainly don't mind detail. :3