Optimum light is 5000 lumens per square foot.
Your flower room is 12 x 15. That makes 180 square feet. 180 times 5,000 is 900,0000 lumens. A 1000 W HPS gives off about 140,000 lumens. Your flower room is gonna need 6 or 7 x 1000W lights to illuminate fully.
Your veg room is 10 x 10. That makes 100 square feet. 100 times 5,000 is 500,000 lumens. Your veg room will take 3 or 4 x 1,000W to illuminate fully.
So it's gonna take between 10 and 12 x 1000W Lights to do the job, if you plan on making use of the entire space.
That's a hell of a lot of light and a lot of electricity usage. Unless you're growing for profit (which is pretty much frowned upon round here, and you will find that people will not offer help if that is the case), I would advise to scale down.
peace RBH