The best place to look for a guild is on your server. You can look in the server forum to see if any guilds are recruiting. You can also keep an eye on trade chat while you are in game to see if any guilds are recruiting. Another place to look is here New Player Friendly Guilds Check In Here! which is a list of new player friendly guilds. Look for guilds on your server as you cannot join a guild that is not on your server unless you pay to transfer your character.
Once you’ve identified a guild, send a whisper (use /w CharacterName) to the person who is recruiting and ask them about their guild and what they are looking for and what you are looking for.
It is very common to try out a few different guilds before you find one that fits you.
From what you’ve said it sounds like you are looking for a casual, possibly ‘friends and family’ guild where there are people who are willing to help out new comers.