You can get money by pressing shift ctrl alt and c. This brings up a little bar at the top left hand corner that is for cheats. Enter the cheat in this case code and perss enter.
Buy the rocket launcher it costs 100$. Set if off and wait till the rocket has gone up and is close to the ground. Use the move_objects on cheat ( it will be effective for the whole time your compuer is on. When you go on your computer next time you have to re-enter the code) and delete the rocket it will give you 2300$. Be careful if the rocket hits the ground it may hit and kill your sim so save before you do this rocket cheat.