How to generate Client Id and Secret (best practise)

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);
}

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