Too easy to make my friend.
You can easily start off with a quarter oz of bud, good trim or both. If using both I go for at least 10 gs a stick of butter. Then mix into whatever cookie, brownie or whatever recipe.
Sometimes I just make toast with cannabis butter lol
There is a process. I'm willing to share with you whenever you want, although some folks might do a better job than me. I've only been doing it for a few years.