[Electriclight]

You can spot the two or three round multipin MIDI ports on the back. You are right, you might not have a need for midi. But it's great for adding strings sounds, triggering samples of drums or whatever. So if you don't know anything about midi then sure, it's not a priority.

Use the soundcard wizard here to find an audio interface. It is not a mixer; it is an external soundcard that gets high quality audio in and out of your computer with low latency. Your stock soundcard won't cut it.

You should be reading all of Brandon's articles on the site about all these subjects.

You will need to upgrade RAM in your computers; 128 just isn't good enough. Fortunately RAM is getting cheap. You need an absolute minimum of 512 and 1G would be better.