Good resources for beginning interior designer

I am starting out as an interior designer and would like to know if there are any books/magazines/web sites that you can recommend for useful design ideas.
All of the resources that I've seen are only showing pictures of lavish, very fancy homes and extremely expensive products. I am looking for something more down-to-earth,. My clientele is not wealthy. They are the normal folk, looking to make some nice improvements in their normal homes.
I want to learn useful information – good tips for beginners. For example, ideas for maximizing space, working with light, understanding colors, etc...
Would really appreciate your suggestions!
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