Moms need help

I really need help so I just found out I am pregnant with my 2 baby. I also have a 1 year old . The problem here is that my one year old he still sleeps next to me and still stuck to the boob how do I train him to sleep by him self and stop taking the boob I wanna train him before this one comes .. and I sooo learned my lesson not to put the baby next to you over night . Well I kinda did cuz he was my first but now it’s so hard to train him 😏any tips how I can train him ?