Those are from my bookmarks named REST API Design:

• vinaysahni.com/best-practices-for-a-pragmatic-res…
• blog.mwaysolutions.com/2014/06/05/10-best-practic…
• https://github.com/WhiteHouse/api-standards
• scotch.io/bar-talk/designing-a-restful-web-api

There are also 2 awesome lists on GitHub if you missed them:

• https://github.com/Kikobeats/awesome-api
• https://github.com/marmelab/awesome-rest

Take a look at Richardson Maturity Model I think with this steps you can archive a nice API REST.

Depending on the language you can find some frameworks and utilities.