|You need a timeline but maybe not quite like this https://commons.wikimedia.org/wiki/File:A_New_Chart_of_History_color.jpg|
So now we have a plan. Next, start a timeline. Your timeline can be drawn on a simple piece of paper or something more elaborate using a software program or website. However you decide to do it, use something that you will stick with.
My timelines incorporate my Research Log. I use Microsoft Excel or a table in Microsoft Word and then I create 4-5 columns. Those columns have headings like Date, Event, Comments, Source Citation. Now this format is flexible. If I'm working on someone who moved a lot, I will include a column on the location they lived in at the time of the event. That way I can see their migration pattern more clearly. Same with someone who used various names or aliases. I want to know what name they were using during what time period.
Overall, you should adopt a timeline that you will use and keep using. One look at my timeline and I know what years I'm missing information and where I need to look next.
Use a timeline for each female ancestor you research. It helps to keep you on track and to see what your know at a glance.
Need some inspiration? Check out this article I wrote for the GenealogyBank Blog entitled Genealogy Timelines: Helpful Research Tools. There's even a link to a timeline template to get you started.