Modding this game is very easy, expecially if you know how to use xml language.
First download Open XML Editor
is a free xml editor, you can use it to open the many xml files that rule the game
All the game variables are coded in xml strings in xml files
Download, for example, my mod
there is an xml file with all the camera variables, joust change
the parameters like zoom or angle and see the result.
There is also a Unit Avatars xml file that is the one who rules all the parameters of the units models like the scale, the animation speed and many authers.
Try to look in to the folders and try to change the parameters, but pay attention to make everytime a backup of everything you change!!!
The first thing i can teach you is how to change the size of the models.
1) open the Data\gamedata\units folder and search for unitAvatars.xml file
2) open this file with the xml editor
3) Each model string starts with the model name and after various model parameters
4) search for the parameter called <f_modelScale>1</f_modelScale>
5) Change it in <f_modelScale>0.5</f_modelScale>
6) now your unit model will look smaller
7) Do it for all your models and you'll have a real scaled mod, infact in this way all the troops will be scaled down to be in scale with the villages and the authers object in the game
like this