Question for co-sleeping momma's

Mesha • Hubby and I have been together 8 years. Have a 2 year old boy and due in June with baby girl!
For starters, I know Co-sleeping is considered dangerous by some. Looking for input from mom's that cosleep. 
My son and I cosleep. He is now 2. I don't plan to kick him out of the family bed until he is ready. He has always slept best that way. But I don't feel it's safe to put my newborn in the same bed with the three of us when she comes. For those of you that cosleep and have a new baby coming.. What did you do? I plan to use a bassinet to start with for my girl but if we have the same issues that came up with my son I might need other ideas so we all sleep better.