[EXPERT ONLY] Convert Sample Laravel 5.2 code into API

I have already completed a sample application in Laravel 5.2 for Insert/update/Delete/List functions. now, I am looking to remove all the database work from this sample application and want to do that using an API. This meant API will have all the database work. API will return JSONResponse Questions: 1. Have you done this before? 2. Where did you perform server side validation for required/unique/min/max? 3. Did you use PUT/Delete/POST/GET Verbs? Any other Verb was used? I will be interested in your bid If you answer these simple questions.