In reply to chris1982:
<The only aspect I don't feel fully comfortable with is how to set up things when I reach the top before I abseil down.>
Presumably inadvertently, you've just touched on one of the details that it's vital to get right when moving outside, in particular to sport climbing.
I'm sure you will have noticed at the wall that when people get to the top when leading, they clip the top anchor and then lower back down; they don't abseil (I'm assuming you know the difference between abseiling and lowering). This is normal sport climbing practice, with the added complication outside of possibly needing to untie at the top to thread the rope through particular types of (non-clippable) anchors to avoid abandoning gear when moving on to another route or going home; this is probably the most dangerous part of sport climbing, and you should definitely seek advice as to the safe procedure, together with the underlying general principles, so you know exactly what to do at the top BEFORE leaving the ground. Sport routes, therefore, are generally set up with a lower-off anchor no more than half a standard ropelength above the ground - ie 30 metres, with 60m being (at the moment) pretty much the standard length of a sport rope (though in some areas, generally abroad, route lengths are creeping up, with 70m, 80m and longer ropes becoming commonplace). Sometimes, for various reasons, one might choose to depart from normal procedure by abseiling rather than lowering off, which involves threading and pulling half of the rope through the anchor after your partner has TAKEN YOU OFF BELAY. I'm shouting here because throughout your climbing career, and in an effort to prolong it, those four words or anything similar should always ring alarm bells; it's the time to pause in what you're doing and make sure that everybody involved knows exactly what's happening, and that it's definitely the right course of action, before proceeding.
Which sort of brings us back to where I started. If it's not clear beforehand between leader and belayer what the intended procedure at the top is going to be, or if something unforseen dictates a change of plan which is not then properly communicated, the seeds will have been sewn for a potential accident; if the leader starts lowering after his misinformed belayer, expecting an abseil, has taken him off belay, the result will quite probably be fatal. I think I'm right in saying that most of the nastier accidents in sport climbing - regarded erroneously by many as a "safe" pursuit - have involved a lack of proper communication at this lower off/abseil stage. So when you're leading, make sure your belayer knows exactly what you're intending to do, and what you expect them to do; and when you're belaying, watch your leader like a hawk, especially when they've reached the anchor, and question at length any apparent request to be taken off belay (which may come in the form of the innocuously, and sometimes unintentionally, shouted "Safe!"), only complying when you're absolutely certain that you have no further part to play in your leader's continued survival.