Moving files & creating folders to move them in.

Just starting to create Applescripts with the responses found here.
I have already created the move script, so that part is more of a question. Depending on the answer a new script may be needed.
The question is, if a move script is always running & new files are placed in the watched folder, does the script wait until the file is stable before it starts to move the file?
Also, I would like the files MOVED, not copied. And although the original move script only copied the file, I added a delete line. I'm wondering if the files might get deleted before they are completely moved.

The AppleScript I have yet to create, if possible would be to create a folder based on the name of a file and then move subsequent files into the appropriate created folders.
For example, the file is named SBSE_xxxxxxx_0108.
The AppleScript would create a folder called 'SBSE_0108' and drop the file into that folder. Any other file that started with SBSE & ended with 0108 would be moved there as well.
Another file comes in as is called WS_xxxxxx_0108.
The script would create another folder called 'WS_0108' and do the same as above.

Thanks guys for any help.

If you are using tell "Finder" and it all in the same script, copy then delete is ok, but use move.

Yes you can, get the file name, break it into parts, make the folder using the names and them move the files into it. These are the tasks AS is good at.