The only known "Mod" is outdated and breaks the game. You might have some luck with a RPGM save editor but be careful there are many that come back whining after doing massive edits and locking up their game. The early game income is gated behind progress and can cause the game to break if you give yourself too much cash in the beginning. To be honest the game is easy enough without cheating, if you can't buy something for your house just keep playing, you will get more and more opportunities to get ever increasing amounts of money.
If you are still intent on cheating maybe hit up
oCATo, he is this this threads resident cheatologist. He might be able to help you.
Good Luck