re: Why did Lord Commander Jeor Mormant (Jorah’s Father) end up at the wall?

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So he goes to the wall to allow Jorah to rule bear island, and Jorah was selling slaves while ruling bear island?
Then Jorah nails to essos to avoid execution via ned?

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Yep. He married a Hightower, which is right under the Lannisters as being the richest family. She was spoiled and Jorah went broke trying to keep up with her appetite. He eventually got into the slave trade, but was caught. Ned was on his way to Bear Island to chop his head off, and then he fled leaving the sword behind.