don't have any idea where to start.. how do i make her shirt and pants and hat? !!!!!!!!

Use each color separately and then stick all your peices together... Look at other pictures and then use those as a guide.

I assume you're trying to do something like this??? http://blog.pinkcakebox.com/baby-shower-cupcake-cake-topper-2008-06-04.htm

Here are some inspiration photos...
http://www.etsy.com/shop.php?user_id=5370486
Here's a very simple one - you can see the basic shapes easily: http://www.christmasspiritshop.com/product.taf?id=SMG-MTB-f