most grow tents come with in intake and outake airhole. the intake slot should be at the bottom and outake at the top. proper circulation would require one fan blowing clean air in and the outake fan suckin old air out. depending on the quantity of pants the amount of fans will need to be...
purchase the fox farm starters kit... it will provide you with basic essentials. it also provides an easy to follow nutrient schedule if you need the extra help
i agree with irish it looks like she could have gone a little bit longer... the best way I believe to tell is based on the collor of the hairs. when 2/3 of the hairs starting from the top cola down have turned amber its prime time to harvest.