Advice on becoming a new mum again with a young child.

Melissa • Mummy to two coming 3 (due August) beautiful children.
So me and my wee son have a very close bond. Hes 4 years old and went threw a traumatic experience just last year. But from it our bond has grew increasingly stronger. He has grew so intentive loving and attached to me. Tells me everything . And gets very jelousy when im around other children or babies or even simply when i give anyone other than him too much attention. I havent told him yet about his baby sister. And was trying to keep it a surprise for as long as possible so he dosnt have too long to wait until shes here but i have spoke alot to him about a new baby. And planted lots of seeds in his wee head. He is coming around to the idea alot but is afraid i wont love him the same. I am adamament to never let this happen. My main focus when she is here is my children. And only my children. Growing there bond big. Aswell as keeping my own. I just wanted some advice on how to manage my time properly and equally between the two. As i know new borns are demanding and hard work at times ans take alot of focus etc. But i dont want that to come in the way of my son having his own time with me too. What ways and what things can i do to like even it out etc. Prob sounds stupid but i do worry about it and i am curious as to how others handled this. Any advice or help would be great