outdoor grow

I am wanting to start to grow outdoors in Ontario, I was gonig to choose Durban Posion as the strain, I was gonig to plant them right in the soil as a seed is that a good way to do since that my only option as of right now, I was thiking of picking up 20 seeds would that get me around 10-15 females, I heard digging big holes is the best way to do them and then tie them down soo they grow more like a bush , what kind of soil, nutes manure would be best and do u add a bit of lime, i was thinking about starting them beginning of june
thanks