So I'm trying to build a vegepygmy cheif,
My question is where are the first party stats?
The only thing that points to one (From paizo materials) is the following
Approximately 1 in 20 vegepymies are chieftains. A vegepygmy chieftain is an advanced vegepygmy (often one with class levels) that carries an infestation of russet mold spores in its flesh. A vegepygmy chieftain infects any creature it hits with its natural weapons with russet mold spores (see russet mold).
Does this mean that I'd simply apply the advanced template, and come up with a cr 1-1/2 Creature, and it gains the special russet mold attack?
Or is there something I'm missing.
No, you haven't missed anything. It's been left open to you, the GM. You can advance it to the CR you desire, either by giving it class levels, advancing HD or applying a template of your choice.