The combo is complicated. Watch the combo bar; when it reaches the area between the two little marker lines, fire the skill. Then the bar starts filling again, and when it's between the markers fire the next skill and so on.
Combo ends when you don't get the timing right, or when the target dies. To prevent this, click on the next target after firing the deathblow skill, so when the monster dies you'll already have a different target selected.
[ Note: I never used Combos. The combo system sucks, but if you want to continue beyond lvl 95 you'll have to get used to it for the PKing ]
Upgrading is done with cores; there used to be a guide on the european forums that explained all the gory details. Either way, upgrading isn't worth it on your level, since you get new gear all the time anyway.
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