Thank you for starting this thread John, which I've just found after almost two years!
OS maps are an excellent resource, but beware of some of the track formations. Some cartographers don't understand the niceties of single and double-slips, trap and catch points etc.
Kelly's Street Directories are very useful for information on shop names, though the last editions came out in 1975. For more up-to-date information on shops, Goad maps are also very good for that sector.
Oral history is a very good source of original material; as someone has stated above, don't forget to have a consent form to use the material.
Finally a little story to end on. Some years ago the BBC ran a project called "People's War". I collected some oral material for it and one lady in particular stays in my memory. After she'd spoken about the Second World War, I persuaded her to tell me more about general life in the town where she grew up.
One day she was allowed home early as her uncle was visiting. I thought this rather strange; children wouldn't be allowed out early just because a relative was visiting. Anyway, she sat on his lap, played on the lawn and had tea. After he'd left she asked her dad why she'd been able to have the afternoon off school. Her father said that her uncle didn't come down from London all that often. "So what did uncle do father?" Well her dad told her that her uncle quite liked writing. "What does he write?". Her dad said uncle had written a few books. "What are they called?" Well, one was The Time Machine, another The Invisible Man and another called The War of the Worlds.....
Really makes history, come alive.
Regards,
Peter