Your blocks look much better than my first blocks. But you asked if the problems you're seeing can give you trouble down the line, and the answer is yes and no. If your points don't match in the center of the block, that is a cosmetic thing and will not cause any further problems. However, if your blocks aren't the correct size, or if they won't lay flat, then that can cause problems that will be much more difficult to fix at a later stage in the quilt-making. One of the most important lessons to learn in quilting, and one that we all have trouble with, is that it's best to find and fix any problem as early as possible. So keep on questioning whether you can do better, and try to get your blocks to be completely flat and the right size. Just be sure you have fun doing it, and don't get obsessed over perfection.