Facebook Open Graph Custom Story?

I'm trying to let user share his action that he made on mobile app without using dialog , so i'm using open graph and create my custom story and action but i have no idea how to pass action type and parameters ??

so can anyone explain it to me or help ?

 if ([[FBSDKAccessToken currentAccessToken] hasGranted:@"publish_actions"]) {
        [[[FBSDKGraphRequest alloc]
          initWithGraphPath:@"me/feed"
          parameters: @{ @"message" : @"hello world" ,@"type":@"Check-In  Place" , @"og:type" : @"place" , @"og:title" :@"Steakhouse, Star Avenue" , @"og:url" : @"www.google.com"}
          HTTPMethod:@"POST"]
         startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error) {
             if (!error) {
                 NSLog(@"Post id:%@", result[@"id"]);
             }
         }];
    }

And What if I want the Facebook Get all the parameters from the url "Meta" ???