1.) the Drives are compatible... the A1200 used HD Floppies...
2.) The KBRDs probably do not work because they aren't making contact correctly...
3.) the White Connector - look at it closely, you can lift it, then insert the ribbon cable and push down on the white frame of it, locking the ribbon cable in place...
4.) there are hacks and adapters which will allow you to use a PC style keyboard, either AT or PS2 style...