Does anyone know the level of net income you need to be generating or expect to generate in order to attract some interest from some venture capital firms?

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You really have to ask the VC firm. The larger ones typically focus on a particular entry point i.e. start up, mezzanine level etc. The smaller ones tend to have a lot more flexibility. If you have a good idea and business model you should not worry about the income level. Good luck.

I would try to find a white knight investor before I found a VC firm you will lose control or at least some control over your firm.

I agree with the right idea, money will chase you.