I would not discourage you from creating a guild, but I would suggest that you join another guild first. Try to find one with similar values and goals to the one you will create. Once the game has developed more, meet other people with common interests. Stay in touch with them. Perhaps when you feel the need to break apart from the guild you have joined, make plans with the guild leader about creating a subguild or an allied guild under your leadership. This way you will instantly have an alliance as well as camaraderie with your former guild members. I\'m sure during this time you could also find someone worthy to help you lead the guild.
In many MMOGs, people who join one-game-guilds or clans tend to guildhop/clanhop. Especially when leadership goes bad, or when there is tension between other members. Sometimes players will also leave to join a stronger guild. The leadership of a guild often makes or breaks a guild. People will join, but it\'s up to you to get them to stay.
If you had a player base to start off with, instead of starting from scrap... I would say that creating the guild right away would be a great idea for you.
No matter what though, nothing should stop you from creating the guild you want. The number of guilds in a game is irrelevant, as well as the similarities in goals or values.
Good luck!