Welcome to the madness of VBCW. I agree with the others, its totally down to you how big or small your games are. I would increase your militia though as they would be the most common combatants. My own Albertine army has two platoons of militia, one platoon of LDV (militia in uniform) and only one platoon of regulars. My Black Shorts army is one platoon of Black Shorts (again militia in uniform) and a platoon of militia. For vehicles I use two Matilda I's, two Rolls Royce armoured cars, one FT-17, a Whippet, a Romfell armoured car and numerous civilian vehicles some of which have improvised armour, all of these (except the Romfell which is strictly for the Black Shorts) get used by either side depending on the scenario.