Custom merchants
 

how to u set up custom merchants and what the items they have are

Add entries to the merchantlist table in your database. This makes up lists of items for sale and which items are in which lists.

Then edit the npc you want to be a merchant. You can either edit his record in the npc_types table directly, or target him in-game and use the #npcedit command to make these changes:
- Make sure his Class is 41
- Assign his Merchant_Id field to the list from the merchantlist table you want him to be

what about like the spell scribe ive seen on a bunch of servers and the leveler that makes u like 30 or so all done the same way?

No, that would be the Perl Quest system. It requires writing script into an external file and then being loaded into the game using default directories and such. Check out the quest development archives for more information and help to get you started.

As for merchants, you could always check out my awesome, spectacular guide located here. :D