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The resource that most conlangers point to is the venerable Language Construction Kit. It's quite extensive. It mostly concerns the linguistic aspects of making your language, but it does address s...
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Source: https://writers.stackexchange.com/a/4687 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
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The resource that most conlangers point to is the venerable [Language Construction Kit](http://www.zompist.com/kit.html). It's quite extensive. It mostly concerns the linguistic aspects of making your language, but it does address some of the issues about making your conlang believable.