Write down every interesting conversation or event in Final Draft - proper screenwriting format. This will be a record of that conversation / event in the most realistic terms you can remember (carry a voice recorder around - there's one on your cellphone) and will also be a source of ideas and characters when you are looking for dialogue / scenes at some time in the future.
Use related experiences. JK Rowling never went to Hogwarts but she used her experiences as a teacher to create that world.
Remember that you don't have to experience everything. Artistic license and the ability to simply create fictional scenes, sequences and characters can carry you a long way.
The Hero's Journey and Transformation through a New World/State is the template upon which the vast majority of successful stories and Hollywood blockbusters are based upon. Learn about this at http://www.clickok.co.uk/index4.html