Gene is right, Bonsai can be a very difficult art form, definitely not beginner plants.
Having said that though, it looks like what you have is
Weeping Fig (Ficus benjamina)
They can be extremely temperamental, and though "they"say partial to full sun, I find that mine does much better in shade. In fact, mine is in the house in low light, doing beautifully as a full size plant. What part of the country are you in?
Was this plant , when purchased, indoors?
Possibly the shock of going from low light to immediate full sun. Best too always move plants at a very gradual pace over days/weeks.
Click on the link I added, and you can learn a bit more about them.
Good luck!
