I'm not sure who made the first one - there's a number of edo groups that made pieces like that (and I don't study them so much...).
The second and third if they're old could possibly be put in the katchushi and tosho bins respectively, though I think they're too thick, etc to be pre-edo. And actually #2 might be assigned to some other nebulous group designation (higo?)
I don't know about #4 either - could be one or more of cast, burned, low quality, etc. if real I'd probably call it some kind of owari piece from the edo period (because of the style/decoration - they loved those birds...).
And I think Grey's right on the last one - some kind of heianjo zogan, though honestly, its a rusty wreck.
FWIW, at this stage, you'd be well advised to go look at some good examples of tsuba in hand before buying any more. Much as I would normally recommend books, for newbies there aren't lot of books to recommend (IMHO) as most are kind of aimed at people who already know what they are looking at - there are no oblique views, etc to help you "get" the pieces. I keep thinking it would be cool to do an e-book for the uninitiated so you could zoom waaay in on the images to see fine details, include VR image sets, microphotographs, etc to try and really show all aspects of a piece, kinda like I did for this piece:
But I digress...
That said, there actually are a lot of "cheep and cheerful" tsuba out there, though you kind of have know what makes a good piece first.