well its a long ester but a good primo cycle for you would be around 500-600mg ew and most primo comes ether 100mg or 200mg so you really dont want to shoot your hole weeks dose in one shot.how you shoot it is all going to depend on the dose of primo you have...
if you get 200mg primo then 3 shots a week=600mg ew
if you have 100mg primo then 2 cc shots 3 times a week will do the same
get you some of that 300 mg/ml primo enanthate out there, and then you can cut back the shots to twice a week or 3 times per week, depending on what you can handle