Well, welcome to amiga.org :-)
The Amiga 2000 is a great machine, I've got a couple of them. Even though they're one of the oldest models, they're still a great machine. Just so we can help you, what actually happens when you turn it on? Do you get a white screen with a hand on it, or a purple screen with a disk being inserted to a floppy drive, or does the screen just stay black? Workbench is the OS for Amiga computers, and so you've got the OS disk, and the install disk. Obviously you've worked out the basics of what you're trying to do, as you've tried to partition it. Is the drive detected when you use HDToolbox? If it is, well then it could be a SCSI problem (termination, etc). Also, does your Adspeed have an IDE controller? If it does, you could just add an IDE drive and ignore the whole SCSI problem.