el, i always plan for planting three times the amount i'm looking for in my outdoor grows and twice as many as i'll need for indoor. this allows for males, plants turned into meals by the pests and those that 'fail to thrive'...and even then i often come up short and have to rely on clones to cover the space. and with you being a beginner and all, i'd plant 10 and hope for 3 nice keeper-ladies...