Wait, so are you contact printing using a light bulb in a box? If you are contact printing with an enlarger it's usually f8 @ 7 seconds (for a perfect exposure contacted on Ilford paper). Print developer is not the same as neg developer, generally the quality of a print is better using print developer instead of film developer but it does work.

And as for your second question, the space in between frames on the negatives, and around where the sprocket holes are, should be a bit lighter than the outer edge where there was no film.

=D