http://www.educatall.com/page/122/Pl...urriculum.html
We used this site alot during my Planning and Implementing course.
Planning a curriculum is very easy and very hard at the same time. I feel like we focused on the planning part for 75% of the time I was in college earning my Associates degree in ECE and still even now while working on my Bachelor's degree I am not feeling completely sure about doing it right.
Mostly what you do is write down all the areas you want to cover (literacy, social emotional, math, science, physical, cognitive etc.) and then plan an activity that meets that area.
Obviously it is way more indepth than that but that is the basics. I would google planning a curriculum and gather as much info as you can from them.