Question on how to operate No.2 Autographic Folding Brownie

Hi. I have a question on operating a No. 2 Autographic Folding Brownie. I picked it up at antique sale and loaded it with 120 film. It stilll has the shutter release cord on it and everything. What I'm wondering about first of all:

How clear is the viewfinder supposed to be? It seems really dusty, even though I've cleaned it and I'm not sure how to focus it.

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Secondly:

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What do the following symbols mean on the top: 25, B (which I think is bulb), T, and 50. Is this the shutter speed? And if so, when I depress the shutter release, do I release it only once for bulb?

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Lastly: How do I know what to set my f-stop at when I'm taking bulb pictures? I know that the larger the f-stop number, the smaller amount of light that enters the lens and I also think that means that everthing will be in focus versus the small f-stop number which lets in more light so that the foreground of the picture is in focus and the background becomes blurred. Is that correct.

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Thank you for your help.

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Tamara (jezabellejaye@hotmail.com)