Robert
Part of the problem with this running lark is that lots of words and phrases have completely different meanings to different people.
I would describe a tempo run as being a warm-up (ideally 1-2mile), a spell of solid effort (a great start for you would be 3-4 miles @ roughly 07:40ish per mile) followed by a cool down (say another mile or two)
Over time, you could increase the length of the quick bit in the middle, or you could do the quicker bit towards the end of one of your runs - so if you were going to do 10 miles, do the first 5 at whatever pace feels comfortable, then set yourself the goal of the next 5 miles each being a little quicker than the last one...
The opportunities for fun (and suffering) are endless really
Edited: 12/10/2012 at 08:06