Buying at local auctions

[William Baptist]

Can anyone point me in the right direction for a previous blog or literature to gain knowledge on buying at auctions? I know what the rents are going for in the area and appraisal. The home doesn't look like it need much work at all but I have seen the roof and I don't know how current the photos are. I'm trying to figure what to offer. Is it as simple as figuring out what number will give me the return I need to cover maintenance, management, taxes and mortgage? And of course minimal acceptable per door cash flow?