A small container too start (solo cup is fine) wait until your see roots out the bottom and transplant to finishing pot. I never like to transplant more than once. Transplant can shock a plant so why risk doubling or tripling (or more) the shock by doing multiple transplants. When you are ready to transplant, moisten the soil so it clumps around the root ball. Turn your container upside down and tap gently on the bottom until the root ball falls out. Dig a hole into your medium, stick the root ball in it and level off the medium...transplant complete.
Good Luck and Great Growing