OK!! I'm beginning to see the Big Picture now.
You will need to be able to monitor your mixes, so you need to connect the sound-card output to your mixer. I'd suggest the analog outs of the 2496 (RCA) to the Stereo 9-10 input (rca to 1/4" adapter needed here x2).
Then you should change the connecting to the 2496's inputs from the mixer's tape outs to the mixer's inserts (channels 1-2 are fine. Only push the plug in to the first click, or it won't work) using the same kind of connections you used for the 2496's outs. This will prevent feedback looping, and allow you to monitor what you have already recorded (thru 9-10 of the mixer) as well as what you are recording live (mic, keyboard, etc.).
You will plug anything you want to record into inputs 1 or 2.
Then to get the sound to come out the Monitor One's you will connect the Control Room outs to the inputs of the Warrior Amp. Then the outputs of the amp go to the monitors (Left & Right).
I don't know what the inputs are on the Monitors, you may need to put bare wires to binding post connectors. You may have to buy a 10-15 foot 1/4" to 1/4" speaker wire and cut it in the middle to achieve this.
I know little about midi, unless you do I would just record the audio of the keyboard into the computer, not the midi. This will be less flexible at mixdown time, but will be easier to get things going initially (I would think!)
There will be more questions once you do all this, but this should get you started.
Well I hope this has been helpful, as I am exhausted now and must take a nap!
Happy recording!!