The best/easiest way to make them in my opinion is to start with flakes. It won't take long to learn how much curve, concavity, turtle back and median ridge you can manage. All that is excellent knapping practice. I work more slabs these days because I can easily saw what I want to, but for ease of working, the flakes are better. The advantage to sawing is getting many more points out of one rock than can be done by percussion reduction.
A lot of knappers use the big stones to make large preforms and use the flakes produced by the reduction process to make smaller points. A person who enjoys making small points can pick up many good flakes at knappins where some of the knappers only utilize the big stuff. Most of the time they are free for the asking.
WA