english, hello! I was on a flint-knapping course a couple of weeks ago and we made a flint knife, with wooden handle bound with nettle cordage and glue made up of beeswax and cedar sap.
Essentially, you need a big chunk of flint (the core), and with a hammerstone hit a straight edge to carve off flakes. This takes practice. None of my flakes are any good
Find a flake suitable for turning into a knife.
You can find a flake with a beautiful straight sharp edge. Use that. Use a pebble to blunt the part you will hold if need be by 'pecking' pieces off the flake.
You could also use pressure flaking to produce a stronger edge, but one that is very finely toothed. You will need a piece of antler. Holding the flake on a little pad of leather use the point of the antler to 'peck' a tiny indentation into the blade. Go all the way along your blade. Flip over and do the other side.
I made a wicked flint saw by creating very large 'pecks' in the cutting edge. Besides the saw I've made a circular scraper, end scraper, concave scrapers for whittling and debarking wood, a couple of knives and a few arrow heads (which I must mount on the shaft I've made with the rest of my tools).
I am a very happy man! Its been an ambition of mine to flintknap for years!