I'm having trouble with creating a merchant within TES CS. Every one I have tried refuses to give the barter, repair, or train option when I talk to them in game. I have everything that will be able to sell checked in the AI section and have tried setting there class to the corresponding merchant selection. I have merchant containers for each filled with goods that they should be able to sell. I would really appreciate some help with this issue as I am rather new to the construction set.

How is the Offer Services package set up on them?

I had it set up so that they would offer services with any set for all schedule options and I didnt know which AI package to select seeing that their is no "Offer Services" option. My friend is working on his own mod as well and I dont believe he set up an AI option for offer services. They just did it.

The NPC must be running an AI package that has 'Offers Services' checked in it.

have a look at this:
http://cs.elderscrolls.com/constwiki/index.php/My_First_Shop#Creating_the_AI

Thank you guys. I messed around further with the AI options and got all my merchants up and running. Thank you very much for your help.