1. set a cue point you want, hit memory button so its saved in one of the 1-10 memory slots, set CDJ auto cue level to "1st memory point"
1a - the 2000 only supports 3 hot cues, thats why, if you want "markers" so to speak then you can use the 10 memory pints and they will show up as yellow markers throughout the track
2 - yes, make a loop, while in the loop save it to a memory slot and then click on the yellow loop icon to the left of it to make it an "Active loop" so it loops automatically when it gets to it, you can set 1 active loop per track
2a-not sure, i use full, change it and see what happens