growing outdoors in the uk

Hi got 12 seeds here under 18/6 lights and there about 16 days under now,going to plant them outdoors in 2 places me and my m8's found.Now this spot is south facing and in some woods on a bank sloping down,where going to cut a few branches back on some trees to clear the way for the sun,dig it now and put down some westlands mp compost with added ji.Now the trees around it are pine and there's like moss all round would it be ok to plant these here or would the moss kill them.There is quite a few dead trees in this wood and all drieded out would this be a bad sign

You'll need at least 6 hours of direct daylight to get any good results. The key is to look for full sun and a close water source.