A lot of planning and discussion goes into making a guild.
Ask yourself,
Is there a need for this guild, or are there already established guilds in this category?
What is the goal of your guild?
Are there people interested in your ideas?
What matierials will you need? (webpage forum etc...)
How will you need to use, or obtain theese matierials?
And lastly,
Is it worth it? Guild making and running requires a lot of work.
When you have answered theese questions correctly, you will be able to start a sucessful guild.
Good Luck,
Monketh

Edit:Btw, if you are actually
serious check out
http://www.guildware.net , it\'s a worthwhile project.