There are many ways to do this:
1. Put yourself into the story and imagine that you are going back in time to meet the character. Think about the "Magic Treehouse" series of kid's books or H.G. Well's The Time Machine.
2. Take one important scene or situation that you've researched. Write it like a story with characters, dialogue, and action. Make up parts that you don't know, like what people look like, things that happen on a moment by moment basis, what people think or feel and how they might react to the events. For example, what did people think, do, and feel when they heard Paul Revere come by shouting "The Redcoats are coming!"
3. Write this as a letter, a diary, a conversation or a monologue. Have your character telling the story of some important event to a friend.
For help in writing and punctuating dialogue and conversation, see: http://hubpages.com/humanities/Punctuation-of-Conv...