Bayleef is a very straight forward and easy build. 
Start on the head, gluing the leaf as soon as you can, 
make your way to the neck, cutting the white holes of the neck piece. 
Build the collar leaves, leaving the base of each leaf a little open so you can glue 
it inside the neck holes. After the leaves are on their place, glue the inner neck 
piece inside the neck for support. Build the body and the legs, following the numbers. 
Close the model at the tail.

IMPORTANT: in order to the head leaf stand, you'll need to create a "skeleton" for it. 
I'm not sure if a thick strand of paper would work, so I recommend building the 
leaf and stem around an open paper clip (great idea Brandon ^^). 
You'll need to glue the clip to the top of Bayleef's head too. 
That way the leaf will have a "bone" inside it, and won't collapse on the stem.