Document Classes ⇒ Indent all the normal text

[lewhoo]

I decided to write my first own latex class that has to reproduce template used for some intenal type of documents made in word. I cannot find how to do one thing. In the template, all standard text (as well as lists etc.) are slightly intended, while heading remain not intended. You can do it with a hangindent, but only for one paragraph. How to define in my own class, that such a behaviour is standard for all the normal text?

I would not like to use any external classes...

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LWP