@cotitg for the base string depends if you are making a bracelet or keychain so for a bracelet I would make it your wrist size with a few inches added if you want to do ties (5-7 in.).
And for the leading string make the color for the background a meter or so and the green for the leaf probably 5-8 ft or so (again these aren’t exact but general idea). For the green on the inside 4-6inches. I hope this helped 🥰❤️