My number one tip for this is to schedule it in and stick to your routine. If you just have a vague idea that at some point you will get something done, it probably won't get done anytime soon. By making an appointment with yourself, and writing it down in your calendar, appointment book, or entering it into your phone or scheduling system, you are more likely to stick to it and actually accomplish it. This works! Especially for those of you who juggle many demands on your time and competing priorities.
If you need to do something over a few sessions or on an ongoing basis, try to schedule multiple sessions at the start, or to set it up in your system as a recurring appointment. If you just do the creative activity once, then you may not go back to finish it. However if you schedule it in for the first of the month every month, or every weekday at 7:00 for 3 weeks, for example, then you are more likely to accomplish the task.
By having regular appointments at the same time every day or week, you can accomplish a task such as creating content for your information product, whether it is writing a book or e-book, creating an online course, painting, crafts, photography, or other.
Even just waking up one hour early and writing for an hour each weekday, will reap results in the longer term. Six months from now that will be 120 hours that you will have spent working on your project. By doing it at the same time every day, you are establishing a routine that makes it become a habit, and much easier to stick with.