Start with 100k Gold and PW:
Start a new game and enter Leemur as your leader name.
When you save your game, include the word multi in the name of your saved game. Now reload that save. This allows you to see the map and you can change what other civs are producing, among other things.
Tons of money:
Ask a rival leader for a deal of 999999 (the maximum number of digits) gold per turn . Regardless of what you give in return, they will give you the cash. Note: This was fixed in the V 1.19 patch, but should work for all earlier versions.
Thanks to Revolution readers Marcus, Leon Magnus and Joe Frasnew!