How to generate Client Id and Secret (best practise)

Question

I am using Client Credential Flow like below

public override Task ValidateClientAuthentication(OAuthValidateClientAuthenticationContext context)
    {
        string clientId;
        string clientSecret;
        context.TryGetFormCredentials(out clientId, out clientSecret);

        if (clientId == "qwe32" && clientSecret == "fgg45")
        {
            context.Validated(clientId);
        }

        return base.ValidateClientAuthentication(context);
    }

1.  what is the best way to generate Client Id and Secret (my approach:- Guid/RandomNumber +Encryption)
2. How to provide Client Id and Secret to API Client (like Fb/Google has developer dasboard) ,do we need to create a dashboard ?