"CHECK" THIS OUT
There's so much crap on the internet. Tons of it. However, every once-in-a-while you run into a simple, but helpful site like this. If you're not very organised or just busy as hell, or know someone like that, this is the site you ought to pass on to them.
There are many checklists on the site. I found the "checklist for life" an interesting one to look over and to give to someone that has a new baby. However, you can use the list no matter what your age is, just go to your age section. My age section ivolves a doctor and a rubber glove. How fun!!