hi there

Im new to modding too, but I think you need to change:

export_descr_unit and under the entry hoplite add 'britons' to the last line

export_descr_buildings make the hoplite buildable by the Britons, can copy the greek entry and the paste and change owner greek_cities to britons

the units files. You need to unpack these files with an editor you can download and then give your new unit a unit card and description. You can copy this from the greek_cities folder but it will be the same colour as the Greeks. To change this you need paintshop pro.

Hope this helps