I am trying to out this in my 1999 Ford ranger. With it fit here?

Yes, our rgbw halo light bar and halo pods fits for any vehicle if you find suitable palce to install . 

What's the difference between spot and flood lights ?

Hello, Spot light is longer and more concentrated while flood light is wide and shorter.

What is the difference between this kit and the other 4 pod 1 light bar kit?

The difference is that the pods and light bar in this kit have halo

Will the hall headlights fit into a jeep tj 1999?

i am not sure, the top light bar is usually 50" or 52", you had better measure it correctly before you purchase it .