You will need more than what's in there, but if the math works out, then I would say go for it. You can use everything in there. I don't see anything that's frivolous or unnecessary or junky. It's all good quality stuff and not a bad place to start.
Most of us end up with dozens of bumpers, in multiple colors. And then you'll need things like lanyard/whistle (I forget if it came with a whistle), starter pistol and/or 12 ga gun with blanks (sometimes more than one each), blind markers for dogs running blinds, some decoys, holding blinds, and other stuff... Some things you can live without. Some things you can't... But the kit looks like a good place to start!!
-K