To start out, write about your hobby; something you are passionate about; a personal experience or something about which you have personal knowledge. You will enjoy doing this and it won't be a chore. These will take littel effort and you can write them fast. Most of my hubs come from personal knowledge andpersonal experiences.
Also, you may have a friend or relative who has in dept knowledge of a subject. Pick his or her brain for the information yu need. Then do further research to confirm facts.