A good starting point is to make a "Person" page on Gwulo for the person you are interested in: http://gwulo.com/node/add/person
Fill in as many of the details as you can, then use the Notes to add any extra information. I see the people who get the best responses include the following information in their Notes:
- What you'd like to find out
- What you already know about the person
- Where you've already looked for information
- Your relationship with / reason for interest in the person
Don't forget to hit the "Save" button at the bottom of the page to save your information to the website.
Then as you make new discoveries, come back and leave a comment on the page. That'll help keep readers interested in your page.