How do you make jedi brades?

If you mean the Padawan braid that Padawans wear as a symbol of them being an apprentice, with species that have hair, they're just small regular braids. Some species that don't have hair make the braids out of special material. For example, in the Clone Wars TV show, Anakin Skywalker's apprentice Ahsoka Tano made her braid out of silka beads used by her people, the Togruta.