End of Co-sleeping

Grecia

My husband and i recently bought our home. We still havent moved in but as soon as we do i am going to start training my 3 year old and 16 months to sleep together but alone. We have been co-sleeping since they were born for certain reason, but now that we have our own home and they are going to have their own room. Its time for both to sleep alone. My question is how do I do it? How do i start to train them?