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D VelD Vel 

Exposing the Salesforce Data as an Rest API

I am new to Salesforce and I would like to get some expert advice on how I can expose the Sales force data as an Rest API so the external System can consume it. I was think if I can create a Apex Class like below
global with sharing class GetAccounts {
    global static Account doGet() {
        RestRequest req = RestContext.request;
        RestResponse res = RestContext.response;
        String accountId = req.requestURI.substring(req.requestURI.lastIndexOf('/')+1);
        Account result = [SELECT Id, Name FROM Account WHERE Id = :accountId];
        return result;

And for the external user to consume the data I thought I can set up up a Connected App and provide them with the Username,password, Consumer Key,Consumer secret and they should be authenticating in to Salesforce to get the URI and session ID. Using the SessionID and URI the should be able to call the API that is exposed above. Is this the right approach, please let me know if I am missing anything here.
Also there is a requirement to use Swagger with the API, is it possible to use the Swagger within the Apex Class. Can you please help how I can leverage Swagger with my API here.