As for planting them out, make sure the soil your planting them into is firm and I mean well troden down, or they won't produce a firm heart.
Slug protection is collars (organic, hit and miss) or slug pellets (non-organic works every time)
Stake a net over them to protect from birds.
Insect attack can be stopped with water with a bit of washing up liqiid in and sprayed on(organic, hit and miss) or one of the multitude if insecticides (non-organic, works every time)
Take your pick. I don't do organic, life is too short and I want to eat most of what I put in.
Tin hat on, prepare for incoming
