The "little things" count for a lot when making and displaying scarecrows. For example, you'd be surprised by how much easier the task of making one goes when you take advantage of a couple of items commonly used in craft projects: safety pins and burlap. I explain this assertion in my full article on making scarecrows.
Scarecrows can be displayed in a number of ways. The two most common poses are what we might term "with backbone" and "without backbone." That is, when a scarecrow is properly supported by a post, it has the backbone required to stand up (I prefer to have the post run right through the scarecrow's body). When such support is lacking, your straw man is a spineless wretch who must be located in a chair or leaned up against a porch railing; pitiful, really. As you can tell, I much prefer a display featuring a well-supported scarecrow.
Not that there aren't other ways to display scarecrows. I've seen them hung from trees, for example; but these "hangman's nooses" are rather gruesome. More creative displays I've witnessed involve scarecrows riding bicycles (picture), motorcycles, go-carts, etc.
Read article: How to Make Scarecrows
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