You should find a good wrestling club in your area or practice on the mats at your local high school. In most areas there are wrestling clubs so find. Another thing to do is find someone who was a trampoline, this is not good for moves dealing with leverage, but is a nice safe place to work on throws without getting hurt. This is also a good place to "Shadow Wrestle". That is, wrestle with an imaginary opponent. On the off season or when there are no wrestlers around, shadow wrestling can be crucial to help out with technique.