Quotations and Literature Forum

If you have ever read Mark Twain's "Roughing it", and have come across the story "Buck Fanshaw's Funeral" (CHAPTER XLVII) please help me with the meaning of the following sentences:

"There'll be a kerridge for you; and whatever you want, you just 'scape out and we'll 'tend to it. We've got a shebang fixed up for you to stand behind, in No. 1's house, and don't you be afraid. Just go in and toot your horn, if you don't sell a clam."

I have a problem understanding the underlined.
What does he mean here by a shebang? The meanings from the dictionary do not make any sense.
I guess by tooting a horn he means "go and talk to them" or "go and preach" or something like that, but what does he mean by "sell a clam"?

Thank you

Mark Twain used [shebang] to describe a vehicle, as well as "any matter of present concern".
http://en.wikipedia.org/wiki/Shebang

There doesn't seem to be much explanation for the other phrase.
William Lewis Manly also used the expression "toot your horn if you don't sell a clam" in his "Death Valley in '49". Maybe he was quoting Twain.
http://www.gutenberg.org/files/12236/12236.txt

Thank you man for answering.
Nobody else cared to answer.
Let me check the links, maybe I could find something usefull.

I think if I'm correct shebang can also mean thingamajing. At least that is what I thought it meant.

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