You can drill mounting holes on the top of the stock bumper for most small to medium size lights, or you can even get light bar tabs welded onto the metal of the bumper.
You can also get universal aftermarket pre-runner light bars that will bolt on along with the stock bumper and give you a mounting point for lights, or aftermarket "bull bars" which bolt to the frame under the bumper and give a mounting point for lights.
You could even get an aftermarket or custom bumper, or try to find a brush guard, too.
You could also get a roof rack, or get a bolt-on light bar rack.
Lots of options when it comes to mounting lights.