Well, everyone is going to have a different opinion on what model works best... so I am not sure you will get much input there. In general, you want to make sure you have adequate filtration. Cephalopods produce a lot more waste than other kinds of animals. I would recommend a protein skimmer (I have one rated 150 gallons for my 55 gallon tank), live rock and some other kind of filtration. That said, there are others that have successfully kept cephalopods with a different filtration system than mine.
Try to find a knowledgeable local fish store to give you advice on how to set up the tank (you will probably not get much advice related to cephalopods there, but that is what Tonmo is for!).
As for food sources, you can go to a seafood market in the grocery store for raw (uncooked) shrimp, scallops and other foods. Some bait stores have food available too. I buy my live food at
aquaculturestore.com, it costs me about $80 every 10 days or so...