freelancer/data/missions/m01a.ini
this will give you $20,000 for the first mission with King

[Mission;add opposite [
mission_title = 1
mission_offer = 1
reward = 20000
npc_ship_file = missions\m01a\npcships.ini

this will give you the moola from the start
freelancer/data/character.ini/newcharacter.ini

[Package;add opposite [
nickname = ge_fighter
strid_name = 11051
strid_desc = 11551
ship = ge_fighter
loadout = MP_ge_fighter
money = 20000

Happy Hunting

As BakedPotatoe said, you can change the initial money and ship by editing \data\missions\M01A\m01a.ini and under the mission heading change the reward from 2000 to what you feel is appropriate. However, to change the ship Juni gives you and you can actually use, it is in the same file further down:

[Trigger
nickname = mrp_accept
system = Li01
Cnd_MsnResponse = accept
Act_SetShipAndLoadout = ge_fighter, msn_playerloadout

where you can change the ship and loadout. The ship is any ship defined in shiparch.ini. The loadout must be listed in \data\ships\loadout.ini so you can either pick a ship and add a custom loadout or choose one of the already built ones. For instance, if you wanted to use Juni's ship, you could change it to

Act_SetShipAndLoadout = li_elite2, MSN03_Juni

The other file listed sets the ship for MP. In SP the player does initially get that ship but it is destroyed on Freeport 7.

Thanks ^_^