Hi, 1 light should be enough for now...just make sure it is a Daylight CFL or 6500K (same thing). It writes it on the box. As the plant grows depending how big you want it...you will add more lights for vegetative stage which is 24hour light, make sure the whole plant is getting light
Afterwards you will buy Warmlight cfl's 2700k and switch to 12hours light on and 12hrs off...you will need a timer and make sure you cover all or most of the plant. The more you cover the better...