I'm reading your manual. Here.
http://www.behringer.com/802/index.cfm?lang=eng
It depends on what you want to do.
/Also, in the "Important instruction" they basically admit the mixer has a built in tuner. They should at least add "RF noise amplifier" to the features list.

It sounds like you've got it pretty much figured out. As Greener alluded to, and as you probably know, the gear you have is not the best, but is adequate for getting started in the world of recording.

If it were me, I would connect:
Mixer Mains -> balanced sound card in (so you can use pan to select the channel to record)
Sound card monitor out -> stereo channel (To take advantage of it being balanced)
I wouldn't bother with the Main Output of the sound card. To keep it simple, keep everything on the computer.

-Steve

I jumped in there too quickly with that reply. After giving it some thought, you are going to run into a problem of not being able to separate your recording mix from your backing track mix when multi-tracking.

When I was first getting started, I used a board with two pre-fader aux sends for the recording mix, and used the main bus for the headphone mix. The post fader FX send on your board would work as a record input, and then you still have the main mix for the headphones/monitors. That only gives you one channel to record, but it would work.

You could get a board with 4 Aux sends, or 4 channels with inserts.

Another option is to go directly from your sound card out to your monitors. Then you can use the left and right main out on the mixer to record.

I decided to just connect Main Out on my mixer to my sound card and connect my monitors to Monitor Out on the card. I'm not going to loop back to the mixer. The mixer couldn't differentiate between my instrument and the loop back from the sound card...I got feedback. Anyway, it works just fine now as long as I enable Input Monitoring within my DAW. I have to turn down the "internal monitor volume" on the m-audio control panel when I want to hear my DAW or else I will hear pre-DAW as well as post-DAW sound. Eh, good enough for me. It still sounds great and I can do up to 24bit/192khz

Do you get delay from your mic to mixer to soundcard through software to soundcard to monitors?
If I do that I get half a second or so.

My delay is around 10ms so it's much less than half a second. I'm using ASIO drivers. I can't even notice it unless I stack up a ton of VST plugins and effects.

Yes I assumed my delay was the USB as I say 2.0 latency.
Luckily I have direct monitor out from the device.