World of Warcraft Game Function-Guilds

A guild is an in-game association of player characters. Guilds are formed to make grouping and raiding easier and more rewarding, as well as to form a social atmosphere in which to enjoy the game

Background 
Guilds offer many benefits including free items, opportunities for groups, access to trade skill masters, quest items, and readily available trade skill ingredients through gathering guild members. You may discover that a guild greatly enhances your gameplay experience. You can meet friends, share adventures, and find people to protect you if you fight in faction versus faction combat. Typically, players in good guilds can go places and do things that players in poor guilds or no guild can't. This is especially the case at character levels 60-85, where the dungeons become very challenging. 

Advantages of a guild 
Having a group of people willing to help, and on later levels, being able to do high-end instances and raid instances such as Obsidian Sanctum, Naxxramas, Eye of Eternity and Ulduar. Also finding Battle Groups will be much much easier. 
Having a group of people to talk to socially wherever you are and whatever you're doing. 
Guild members are often a more reliable and more kind source of information than general chat. 
A guild bank lets you exchange items not right for your class or style with ones you prefer or simply help out those less fortunate. With patch 2.3 real guild banks have been introduced and players no longer need to host a bank character for their guild. 
Guilds are a great way to improve your World of Warcraft experience.

Find a Guild 
There are many ways to find a Guild. Here are a few spots to check out: 
Join the Guild Recruitment Channel in game 
Watch the Trade Channel in game for recruiting guild messages 
Check the Warcraft Forums 
Use guild community providers to find guilds that are recruiting players of your class/spec.

Grouping 
Grouping can be a good way to find a guild. Team up with people and play with them for a while. Make friends with them and play together for several days. If they get to like you, they will usually want you in their guild so that you'll continue to play with them. After helping them out, inquire about their guild. Perhaps they may help you join. 

Starting a guild 
Talk to a guild master NPC in a major city. A charter can be purchased for 10. You will need 4 Players to sign the charter before you can turn it in and start your guild.  
Guild names are case sensitive - this means that there could be two guilds, one named Guild of Rogues, and the other named Guild Of Rogues on the same server. 
When signing a guild charter, once a player's character signs, no alternate characters on that account may sign. The charter must have signatures from 4 other Players, each on a different account. This is why people sometimes offer to pay to have their charters signed. Yet you can have different character from the same account join the guild after charter is turned in. 
Once you begin getting signatures on your charter, focus on getting the remaining signatures on your charter and registering the guild. Signatures can disappear if you delay, since players are allowed to put signatures on other charters until you turn yours in.