A few of us paddled the Elm Fork of the Trinity River from Dimension Tract in Carrollton to California Crossing in Dallas a few weeks ago. This was an 8 mile paddle and weather aside, it was a very pleasant trip. That said, I really cant comment on if it is a good place to fish, but it is a very nice place to paddle.
I belong to a few local kayak groups who have a few paddles coming up in that part of the Trinity in the next few weeks if you're looking for a local river trip with friendly people who are all pretty willing to give you pointers on how you can become a more effective and safe kayaker, you might find these interesting.
Trinity River Float - 11/08/2014 You have to be a member of the meetup group to view the details of this trip so I've included a description.
Dallas Down River Club - Urban Paddle - 11/16/2014Trip Description:
Meet at McInnish Park on November 16th at 12 noon. We will have a picnic lunch and get on the water by 1 pm for a beautiful Sunday afternoon paddle. We should see the change in the leaves this time of the year. We will paddle upstream to the I-35E Bridge and back ~ 6 miles and about 3 hours of paddling.
Gear Requirements: Basic items; life jacket, canoe or kayak, water, insect repellent, Picnic blanket or folding chair, and sunscreen. Also, consider bringing rain gear - November can have cold rainy weather.
Meals: Lunch will be a picnic please bring your lunch.
Back-up Plans: In case of foul weather or high water we will reschedule this event.