Get these professionally designed basment floorplans. These are actual floorplans laid out for clients with actual basements, just like you. They give you ideas and direction to work with.
Thirty floorplans in all, the houses they were designed for come in all shapes and sizes. So you're bound to find some that approximate your own house. The plans come with a key plan that shows you what everything means in the files.
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If you want just the floorplans, this is the product for you. You can view the floorplans with the Adobe Acrobat Reader, which is available free on the web, in case you don't already have it.
Here are some samples of the floorplans. You will be able to see all the detail in the files, because these are large.
Windows and 
Macintosh.
