:hmmm: I am new to modding and want to learn how to do some basic modding, just so I can tweak this game in many different but balanced ways.
I want to try to mod it so that each faction only has one starting city so that the game starts out slow but then builds up with momentum.

I tested it out with england, but I went wrong somewhere, here is what I did, any advice would be great as to how to go about doing this.

This is how I changed englands settings in the beginning.

; >>>> start of factions section <<<<
faction england, trader henry
ai_label catholic
denari 4000
denari_kings_purse 2500
settlement castle
{
level town
region Nottingham_Province
year_founded 0
population 1000
plan_set default_set
faction_creator england
building
{
type core_castle_building motte_and_bailey
}
}

character William, named character, male, leader, age 50, x 107, y 155
traits Factionleader 1 , GoodCommander 1 , Intelligent 2 , VictorVirtue 3 , PublicFaith 2 , BattleDread 2 , StrategyDread 2 , ReligionStarter 1
army
unit NE Bodyguard exp 1 armour 0 weapon_lvl 0
unit Spear Militia exp 1 armour 0 weapon_lvl 0
unit Spear Militia exp 1 armour 0 weapon_lvl 0
unit Town Militia exp 1 armour 0 weapon_lvl 0
unit Peasant Archers exp 1 armour 0 weapon_lvl 0

character Robert, named character, male, age 24, x 107, y 155
traits GoodCommander 2 , LoyaltyStarter 1 , ReligionStarter 1
army
unit NE Bodyguard exp 1 armour 0 weapon_lvl 0

character Rufus, named character, male, heir, age 26, x 107, y 155
traits Factionheir 1 , LoyaltyStarter 1 , NaturalMilitarySkill 1 , GoodCommander 1 , ReligionStarter 1
army
unit NE Bodyguard exp 1 armour 0 weapon_lvl 0

character Geiles, admiral, male, age 20, x 112, y 146
army
unit cog exp 0 armour 0 weapon_lvl 0

character Nigel, admiral, male, age 34, x 105, y 141
army
unit cog exp 0 armour 0 weapon_lvl 0
character Richard, spy, male, age 20, x 107, y 160
traits GoodSpy 2

character Samuel Blacke, merchant, male, age 25, x 110, y 134
traits GoodMerchant 1

character Laurence Bidell, diplomat, male, age 29, x 107, y 130
traits GoodDiplomat 2

character Aston, priest, male, age 35, x 113, y 151
traits NaturalPriestSkill 2 , StrongFaith 2 , PriestLevel 1

character Cecilia, princess, female, age 25, x 111, y 151
traits IAmPrincess 1 , NaturalPrincess 2 , GoodPrincess 1

character_record Matilda, female, age 49, alive, never_a_leader
character_record Henry, male, age 12, alive, never_a_leader
relative William, Matilda, Rufus, Cecilia, Robert, Henry, end

Then I change Nottingham and Caen to rebel cities.

settlement castle
{
level town
region Caen_Province

year_founded 0
population 800
plain_set default_set
faction creator england
building
{
type core_castle_building motte_and_bailey
}
}

settlement
{
level town
region_London_Province
year_founded 0
population 2000
plain_set_default_set
faction_creator_england
building
{
type core_building wooden_pallisade
}
}

then i put the troops in

character sub_faction england, George Duncan, general, male, age 30, x 109, y 147
army
unit Peasants exp 0 armour 0 weapon_lvl 0
unit Spear Militia exp 0 armour 0 weapon_lvl 0
unit Spear Militia exp 0 armour 0 weapon_lvl 0
unit Spear Militia exp 0 armour 0 weapon_lvl 0
unit Peasant Archers exp 0 armour 0 weapon_lvl 0
unit Peasant Archers exp 0 armour 0 weapon_lvl 0

character sub_faction england, John Cook, general, male, age 26, x 104, y 134
army
unit Mailed Knights exp 0 armour 0 weapon_lvl 0
unit Spear Militia exp 0 armour 0 weapon_lvl 0
unit Spear Militia exp 0 armour 0 weapon_lvl 0
unit Spear Militia exp 0 armour 0 weapon_lvl 0
unit Peasant Archers exp 0 armour 0 weapon_lvl 0
unit Peasant Archers exp 0 armour 0 weapon_lvl 0

any advice on what else i need to do would be very helpful