That size is what you need to start to learn with. It will be very hard to make an point out such small stuff, but you can learn how to take off a flake with that size. The biggest mistake that people make is trying to start with large pieces of stone and end up with a thick crud item and a bunch of broken small flakes. You have to learn to be able to remove a flake 1st not matter the size and then you can move up the larger pieces. Get yourself a good flintknapping kit and read all you can on knapping. Just remember you have to break a lot of stone, get a lot of cuts and hit yourself a few 1,000 times. Just don't give up ,if you keep doing it and pay attention to what you did when something went wrong, you will learn this. flintknapping is not something that comes to everyone over night. I have taught a number of classes and folks pay $200 for the weekend class, 1st day is in the class room going over the styles and the mechanics behind it all. The 2nd day they get to break stone and I walk around an try to help out by giving pointers. We take a lunch break and 75% won't come back, they thought it would be much easier, their leg hurts, fingers are soar. If you need some pointers PM me and I'll do the best I can to help you.