Hell, I AM a primitive weapon!
OK, seriously now, start with a stick, any stick. Just grab the first stout stick you can find. Then look for a long stout stick. Then arrange to sharpen your long stick to a point, and, hopefully, fire harden it soon. That's a good start.
Next, look for a good throwing stick. Think "rabbit stick." Maybe your first stick will fill this role, or maybe you need to modify it or look for another. You're not trying to make a returning boomerang, but a stout stick shaped kind of like that works pretty well for bagging birds and other small game on the ground or maybe flying low. Usually you throw it sidehand so it spins or rotates horizontally and parallel to the ground. A man I worked with many years ago grew up really poor. I mean DIRT POOR! He used his daddy's claw hammer like that to throw at rabbits, and he bagged them often so the family could eat better.
Next, you may want to make a long stick with multiple points, sort of like a frog gig. Especially if you find yourself near water, you can feed yourself better with that maybe. It's not a spear usually. Use it to jab at a fish or frog and pin it against the bottom in shallow water so you can grab him with your free hand.
There are stone tools and weapons, bolos, and slings, but you can figure those out I think. The longer you're in the woods, the more tools you will make probably.
If necessity is the mother of invention, as we've been told, then poverty must be the mother of creativity.
