This mod will allow you to choose a set of preset items you will start with this will also delete the starting items you normally start with, to change what preset you start with go into "Mod Setting" > "Start Up" and change the Field next to "Script Config Start" by default it's on medium.

SMALL:
Copper/Iron Plates: 200, Iron Gears: 50, Yellow Belts: 250, Splitters: 25, underground belts: 25, Burner Drills: 25, Stone Furnace: 25, Coal: 200
MEDIUM:
2x of everything and additionally, Assembly Machine Tier 1: 50, Long Handed Inserters: 50, Pump: 1, Boiler: 10, Steam Engine 20, Coal: 400, Pipe/Under-ground: 50
BIG:
Will give you 2x that MEDIUM gave: items, logistics, research automation will also be preResearched and a car!