The newbie trainer should tell folks where to go when they do not meet the level requirement. Here's the information found in HELP GUILDS:
Note that some guilds of your class are more advanced than others.
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Past Guild Locations:
The Guilds of Modrian are located as follows:
Mage Guild: South side of The Way of Magik.
Cleric Guild: Southwest corner of the Temple of Guiharia.
Thief Guild: The Dagger Bar, on Common Road.
Barbarian Guild: Just north of Mercenary Street, called
the Hangout of Horde.
Knight Guild: On Noble Road.
Anti Paladin: West Wall Road, Shrine of Veloth.
Ranger Guild: Off of Eastern Wall Road.
Evil Cleric: West Wall Road, Temple of Zhel.
Bard Guild: Off of Old Bard Road.The Guilds of New Arrnos are located as follows:
Mage Guild: Guild spire of the Maji's Tower.
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Anti Paladin: In the warehouse on West Ishtar Drive.
Knight Guild: The Temple on Western Main Street.
Cleric Guild: The Temple on Western Main Street.
Evil Cleric: South end of Kali Row.
Thief Guild: South side of East Main Street.The Guilds of and near Istan are located as follows:
Ranger Guild: South side of Fortification Street.
Thief Guild: Off alley on east side of Mastodon Inn.
Barbarian Guild: On the north side of the Na River.
Monk Guild: West of Istan & North on a footpath. -
Future Guild Locations:
The Guilds of Electro Centralis are located as follows:
Cyborg Guild: Off of Sunset Wall Road.
Psychic Guild: North of Water Square.
Mercenary Guild: Off of Mercenary Quarter
Physic Guild: South and up from the Museum of Technology.
Monk Guild: East Wall Road.