Aluminum strip, 10 inches wide and .006 inches thick as a dipole.

How long?

Any special considerations?

How long you are to make your dipole, and what frequency do you intend to
operate?

How can I predict the band width?

In general wider and thicker produce wider bandwidth. Short dipoles or long
ones in terms of wavelength may have reduced bandwidth because of limitations
of matching devices.
As you know, bandwidth does not mean a good antenna. A resistor can have a
huge bandwidth, but radiate very little.
73 Gary N4AST