One way of figuring out which scale you're after without having any music theory knowlage is to simply hook up an arpegiator. Then hit record and start mashing that keyboard. Eventually you'll find something that fits, even if the notes are out of order. Hit stop, crop the chord that did the trick in your sequencer and start moving the notes that make that chord up around till they form some sort of sequence that is pleasing to the ear...
Was gonna say that idea. Gives a good starting point for experimentation and things'll start to make sense if you do this in conjunction with learning/reading a bit.