What kind of visa do we need??

Jeramie, if you go there for sightseeing purpose a single-entry tourist L type is enough because according to what you said, you just travel around all over China.
As for the bank certificate, there is no requirement for a specific amount, but you need to make sure that it will cover all your expenses in PRC.
I think you’d better provide your current job as the support document. Actually, you just need to provide the income certificate, work certificate, or bank savings account as a proof of your financial standing.