Removing light switch but keeping the power
For the TV. Simply use a twist-on wire connector to pertinently connect the two wires together, instead of connecting them to the switch. 

As for adding more lights.  If you have attic access, you'll simply install all the lights, and run the wiring from the attic. Run a line from the switch box to the first light, and connect all the other lights in parallel with the first one.  If you're not sure how to wire a simple light circuit, I suggest studying up or hiring a professional.