You will get the most of e-portfolio when you develop it in time. The picture below depicts principles of e-portfolio as well as indicates the process behind your work. The artifacts can be related to the past ("I can", "I did it"), the present ("I am working on it") and the future ("I plan", "I intendt to"). Each of these contribute to the story you tell about yourself and your professional development.
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Complete your story with the artifacts related to the future. Think about your plans and your long-term goals.

Design your action plan and include it in your e-portfolio, with actual events, dates, deadlines and media that you will use to capture digital evidence.
Plan recording and documenting of your activities that can be wrapped in digital format. Think ahead of the tasks that you need to take up to gather relevant evidence eg. borrow a digital camcorder, get help with photo-editing or taking, download audio-recording software, learn how to scan and the like.
Modify your plan in time, be flexible but also stick to the principles. Enhance it rather than trim.