Advice Please!!!

Okay, so today I started to get nervous about having more than one child. I'm nervous about how I'm going to coordinate things, schedule things out and attempt to keep everyone somewhat content and happy. If there's anyone out there who has more than one child, PLEASE tell me your secrets to how you manage life with more than one child! Avonlea is at an age where she's learning patience, but it's really easy to pick her up and comfort her whenever I need to. Soon, I won't be able to stop whatever it is I'm doing and do that. Any advice is greatly appreciated. :)