First, I wonder if you might need better scanning software. Some people like Vuescan from, but it doesn't work with all scanners. It's shareware, so you can download a trial version to see if it will work with your scanner.

That should allow you to scan directly into Photoshop by going File/Import/ - then selecting Vuescan as the driver. You should be able to scan as greyscale, make your adjustments, and output however you want.

Email me privately if you'd like.