Hey Track,
A pretty simple way to calculate tourney green speed is to add approximately 30% to a level putt. This is especially true as the putt distance increases. If the putt is 5 ft, i will probably hit it 4. If it is 10, i would probably hit it 7-8. Anything over 10 ft, i apply the 30% rule.
As for putting from the fringe, you definitely have to add some power. That all depends on how much fringe the ball has to roll across before it reaches the putting surface. If i am barely on the fringe, i usually ignore it. If i have, say, 3 ft of fringe to putt across, i would add 2 or 3 feet of power. Although it can be done, i seldom putt from the fairway.
Hope this help some...