There have been some Members who have reported that a wired USB keyboard will work with the iPad. The problem is that the USB 'port' on the iPad drives only 10mA and many keyboards take more than that.
A Bluetooth keyboard is considerably easier - I have been using several different BT keyboards without any trouble at all.
Since you've a JB iPad I'll move this to the JB section, where you'll probably get a better response. Obviously a non-JB iPad won't support a mouse, but I seem to recall (I'm not a JB guy) that there are some tweaks that allow mouse support on a JB iPad.
Tim