If you have any planets in the 2nd, look to them. I agree with Claire: Look also to your 8th house, which deals with "shared resources" such as inheritances, money from a marriage or SO, insurance, &c. Most people today make money from their jobs, and these would be 10th or 6th house matters.
If your 2nd house is untenanted, look at the planet ruling the sign on the house cusp, by its own house and aspect. Each planet rules different ways in which you might make money. For example, Uranus rules electronics, Mercury suggests some kind of information exchange and your intelligence, the sun might suggest the salesman who "sells himself" more than the product, &c.
Then a lot depends upon aspects. My ex had Jupiter in the 2nd, but it was afflicted and he had real difficulties with money management. Usually Jupiter and Venus are seen as beneficial, but look at how they are aspected. With a square to Saturn or Pluto, for example, this could be someone who overspends and then can't pay the bills later on. A well aspected Saturn might be frugal--a real saver; whereas an afflicted Saturn might experience poverty.