Exported mp4 or flv has much smaller frame size than the original

Not sure if I started the project the wrong way or if I'm doing something wrong when I export.
My imported file is an mp4 29.87 fps 44,100Hz 16 bit stereo.
480x360
When I export it as an flv or mp4 the image is about the size of a postage stamp surrounded by a huge black border.
Any help would be much appreciated.
I'd rather export and flv.
Martin
P.S. I'd like the exported size to be around 390x214 or something a tad smaller than 400 wide.

Thank you Hunt for your reply.
I was an editor for 30 years (Michael Redbourn) and did some editing on Premiere a few years back for a client, but somebody set up the pre-sets and did the export for me, so as is obvious I know next to nothing about how to do either.
What is your Sequence Preset? Does it match that Source Footage?
I didn't see any preset that matched 44,100 hz
How can I check to see what my sequence preset is?
In those Export formats, what are the Presets used?
What are the settings for the Frame Size options?
In those formats, if you chose, say a DV Preset, and did not do cropping, you would get what you describe.
I tried several and certainly one of them was a DV preset, and I didn't crop.
The answers to the above questions should give others something to work with, and likely get you a solution to the issue.
I'm really just experimenting with a short sequence and to reedit it will be really simple, so if you could tell me which presets and export settings to use, I will redo the project and learn a lot at the same time.
Original clip is an mp4 29.87 fps 44,100Hz 16 bit stereo 480x360
I'd like the exported size to be around 390x214 (preferable .flv) or something a tad smaller than 400 wide.
Thanks again,
Michael

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Author: [email protected]
Date: 2008-06-06 19:05:02 -0700 (Fri, 06 Jun 2008)
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Also reducing HexEncoder buffer size from 64K to 32K to help with the smaller stack size of the AVM on Mac as part of fix for SDK-15232.
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