Right at the very top of where you posted this, there is a post by Symbolic explaining EXACTLY what you asked. Try acutally reading and searching the message board before posting about something already addressed, especially when it's stuck AT THE TOP OF THE PAGE!!
There are many benefits to a guild. You get a guild room to challenge people and can actually set up your guild room for leveling cards. You have a community of people to learn from and trade with. There are many guilds recruiting everyday. You just have to take the time to browse the boards and find out their rules.