need some help

okay recently i’ve taken up film making and 3d, and so for my school film makers club i’ve decided to do mix of cgi and live action for a short scooby doo film. my problem is that i’m pretty new to the blender interface and i have no idea where to start with modelling scooby doo.
so i was wondering if anyone knew of any tutorials or something that could help me?

Probably need some reference images…