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I'm bit confused what exactly did you get

I think most razor blades nowadays are double-edge ones. Feather makes single edge blades and they fit their razors, not sure if they work with anything...

welcome to srp

as far as brush from antique store goes, it depends. if it looks good i'd say it's very likely to work very well too. for cleaning it you can use shampoo.
as far as straight razors...