looking at the rankings and current exp rates, it shouldn't be hard to get to the top 10 guilds. It's recommended that the guild master should be really active, be able to judge things well as a 3rd party prospective, and probably be a member too.
to top that, you need an active bunch of committed people to join the guild. Now's not the time since we're pretty dead. But if you start right away when summer break starts and a lot of people come back, it will definitely be really successful by the end of summer break.
Guild knowledge 101