This on my 300. I used the mirror mount point for the lights and used mirrors from another bike on the handlebars.
These are on my Yamaha YZF-R15, which uses similar mounting to the Ninja 250. I used hollow 25mm section aluminium tubing and swapped the stock mirror bolts for longer ones.
Lights on the forks may be useful for other vehicles to see you, but they are not very good for seeing down the road at night. For that they should be mounted up high, depending on your local road rules and regulations.