Of course, having ideas for books means nothing if you don’t keep track of the ideas. I use the voice recorder app on my smartphone and transfer the files to my computer later on.
You can carry a notebook with you if you’d rather. Everything's important. Remember all you can.
Start and maintain a plot saver file, containing anything that might become a plot idea, even though it may not be one yet. What makes the plot saver file useful is going through it again.
Starting a new book, I go through my plot saver file and combine things I might not have considered combining before. Ideas are all around you, but you have to pay attention. Talk with new people. Be curious and patient. Let people ramble on about their personal problems. (Just don’t try to solve them.)
By being open to other people around you, you can gain experiences, glimpses of private lives. You’re learning what makes people tick. How they behave. As a writer, you need to know the inner workings of people because people are the heart of your writing.
Develop a personal kind of radar by raiding the news, the bulletin board at the laundry, your Facebook or Twitter writer’s groups, looking for ideas. Take in and absorb everything and, if you're smart, you’ll tuck it away so you can ﬁnd it when you need to. Train yourself to notice the little things you see and hear and save them, so you can ﬁnd them and use them later. You never know when a little scrap of fact becomes something important.
Above from the book NOVEL SECRETS,
available for Kindle: