Then I looked more in to Goldcoin and saw it has similar features to Bitcoin and Litecoin but with some new features.
Dont you know there is like 1000 Bitcoin copies? It is simple to do it and you can use all bitcoin infrastructure. You dont have to do anything except chose a fancy name.
If I was to launch a coin I would never come up with the idea to call it anything Bitcoin because the branding the real Bitcoin has will just crush you.